According to the Islamic expositors, the following passage,
And never say of anything, “I shall do such and such thing tomorrow.” Except (with the saying), “If Allah will!” And remember your Lord when you forget and say: “It may be that my Lord guides me unto a nearer way of truth than this.” S. 18:23-24 Hilali-Khan
Was “revealed,” because of Muhammad’s failing to say insha Allah (“if Allah wills”). Suffice it to say, this caused Muhammad quite a bit of embarrassment:
Reason why this Surah was revealed
Muhammad bin Ishaq mentioned the reason why this Surah was revealed. He said that an old man from among the people of Egypt who came to them some forty-odd years ago told him, from `Ikrimah that Ibn `Abbas said: “The Quraysh sent An-Nadr bin Al-Harith and `Uqbah bin Abi Mu`it to the Jewish rabbis in Al-Madinah, and told them: `Ask them (the rabbis) about Muhammad, and describe him to them, and tell them what he is saying. They are the people of the first Book, and they have more knowledge of the Prophets than we do.’ So they set out and when they reached Al-Madinah, they asked the Jewish rabbis about the Messenger of Allah. They described him to them and told them some of what he had said. They said, `You are the people of the Tawrah and we have come to you so that you can tell us about this companion of ours.’ They (the rabbis) said, `Ask him about three things which we will tell you to ask, and if he answers them then he is a Prophet who has been sent (by Allah); if he does not, then he is saying things that are not true, in which case how you will deal with him will be up to you. Ask him about some young men in ancient times, what was their story? For theirs is a strange and wondrous tale. Ask him about a man who travelled a great deal and reached the east and the west of the earth. What was his story? And ask him about the Ruh (soul or spirit) — what is it? If he tells you about these things, then he is a Prophet, so follow him, but if he does not tell you, then he is a man who is making things up, so deal with him as you see fit.’ So An-Nadr and `Uqbah left and came back to the Quraysh, and said: `O people of Quraysh, we have come to you with a decisive solution which will put an end to the problem between you and Muhammad. The Jewish rabbis told us to ask him about some matters,’ and they told the Quraysh what they were. Then they came to the Messenger of Allah and said, `O Muhammad, tell us,’ and they asked him about the things they had been told to ask. The Messenger of Allah said…
(I will tell you tomorrow about what you have asked me.) but he did not say `If Allah wills.’ So they went away, and the Messenger of Allah stayed for fifteen days without any revelation from Allah concerning that, and Jibril did not come to him either. The people of Makkah started to doubt him, and said, `Muhammad promised to tell us the next day, and now fifteen days have gone by and he has not told us anything in response to the questions we asked.’ The Messenger of Allah felt sad because of the delay in revelation, and was grieved by what the people of Makkah were saying about him. Then Jibril came to him from Allah with the Surah about the companions of Al-Kahf, which also contained a rebuke for feeling sad about the idolators. The Surah also told him about the things they had asked him about, the young men and the traveler. The question about the Ruh was answered in the Ayah…
(And they ask you concerning the Ruh (the spirit); say: “The Ruh…”) (17:85). (Tafsir Ibn Kathir http://www.alim.org/library/quran/AlQuran-tafsir/TIK/18/1; underline emphasis mine)
Muhammad’s lord deliberately withheld the revelation for fifteen days solely because his so-called prophet neglected to say “if Allah wills”!
If Allah was truly merciful, he could have simply immediately “sent” Jibril with the answers and corrected his messenger for failing to say insha Allah, instead of embarrassing him in front of his enemies.
If this weren’t bad enough, Muhammad taught that Allah even shamed Solomon for also neglecting to say “if Allah wills”:
Saying “If Allah wills” when determining to do Something in the Future
Here Allah shows His Messenger the correct etiquette when determining to do something in the future; this should always be referred to the will of Allah, the Knower of the Unseen, Who knows what was and what is yet to be and what is not to be, and how it will be if it is to be. It was recorded IN THE TWO SAHIHS that Abu Hurayrah said that the Messenger of Allah said…
(Sulayman bin Dawud said: “Tonight I will go around to seventy women (according to some reports, it was ninety or one hundred women) so that each one of them will give birth to a son who will fight for the sake of Allah.” It was said to him, (according to one report, the angel said to him) “Say: `If Allah wills’”, but he did not say it. He went around to the women but none of them gave birth except for one who gave birth to a half-formed child.) The Messenger of Allah said, (By the One in Whose hand is my soul, had he said, “If Allah wills,” he would not have broken his oath, and that would have helped him to attain what he wanted. ) According to another report, (They would all have fought as horsemen in the cause of Allah.) At the beginning of this Surah we discussed the reason why this Ayah was revealed: when the Prophet was asked about the story of the people of the Cave, he said, “I will tell you tomorrow.” Then the revelation was delayed for fifteen days. Since we discussed this at length at the beginning of the Surah, there is no need to repeat it here. (Ibid. http://www.alim.org/library/quran/AlQuran-tafsir/TIK/18/23; capital and underline emphasis mine)
Here are the hadiths in question:
Narrated Abu Huraira:
Allah’s Prophet Solomon who had SIXTY WIVES, once said, “Tonight I will have sexual relation (sleep) with all my wives so that each of them will become pregnant and bring forth (a boy who will grow into) a cavalier and will fight in Allah’s Cause.” So he slept with his wives and none of them (conceived and) delivered (a child) except one who brought a half (body) boy (deformed). Allah’s Prophet said, “If Solomon had said; ‘If Allah Will,’ then each of those women would have delivered a (would-be) cavalier to fight in Allah’s Cause.” (See Hadith No. 74 A, Vol. 4). (Sahih al-Bukhari, Volume 9, Book 93, Number 561 https://www.searchtruth.com/book_display.php?book=93&translator=1&start=0&number=561)
Narrated Abu Huraira:
The Prophet said, “Solomon (the son of) David said, ‘Tonight I will sleep with SEVENTY LADIES each of whom will conceive a child who will be a knight fighting for “Allah’s Cause.”’ His companion said, ‘If Allah will.’ But Solomon did not say so; therefore none of those women got pregnant except one who gave birth to a half child.” The Prophet further said, “If the Prophet Solomon had said it (i.e. ‘If Allah will’) he would have begotten children who would have fought in Allah’s Cause.” Shuaib and Ibn Abi Az-Zinad said, “NINETY (women) IS MORE CORRECT (than seventy).” (Sahih al-Bukhari, Volume 4, Book 55, Number 635 https://www.searchtruth.com/book_display.php?book=55&translator=1&start=0&number=635)
Narrated Abu Huraira:
(The Prophet) Solomon said, “Tonight I will sleep with (my) NINETY WIVES, each of whom will get a male child who will fight for Allah’s Cause.” On that, his companion (Sufyan said that his companion was an angel) said to him, “Say, ‘If Allah will (Allah willing).’” But Solomon forgot (to say it). He slept with all his wives, but none of the women gave birth to a child, except one who gave birth to a half boy. Abu Huraira added: The Prophet said, “If Solomon had said, ‘If Allah will’ (Allah willing), he would not have been unsuccessful in his action, and would have attained what he had desired.” Once Abu Huraira added: Allah apostle said, “If he had accepted.” (Sahih al-Bukhari, Volume 8, Book 79, Number 711 https://www.searchtruth.com/book_display.php?book=79&translator=1&start=0&number=711)
Narrated Abu Huraira:
(The Prophet) Solomon son of (the Prophet) David said, “Tonight I will go round (i.e. have sexual relations with) ONE HUNDRED WOMEN (my wives) everyone of whom will deliver a male child who will fight in Allah’s Cause.” On that an Angel said to him, “Say: ‘If Allah will.’” But Solomon did not say it and forgot to say it. Then he had sexual relations with them but none of them delivered any child except one who delivered a half person. The Prophet said, “If Solomon had said: ‘If Allah will,’ Allah would have fulfilled his (above) desire and that saying would have made him more hopeful.” (Sahih al-Bukhari, Volume 7, Book 62, Number 169 https://www.searchtruth.com/book_display.php?book=62&translator=1&start=0&number=169)
Pay close attention to the fact that neither Muhammad nor the Islamic expositors could figure out whether Solomon slept with 60, 70, 90 or 100 women, even though other reports state that he had 300 wives and 700 concubines:
Or nay are they jealous of people namely of the Prophet for the bounty that God has bestowed upon them in the way of prophethood and abundance of women? In other words they wish that he be deprived of such things saying ‘If he were truly a prophet he would not be concerned with women’. For We gave the House of Abraham his forefather the likes of Moses David and Solomon the Book and wisdom and prophethood and We gave them a mighty kingdom David had ninety–nine women and Solomon had a thousand free women and slavegirls. (Tafsir al-Jalalayn https://www.altafsir.com/Tafasir.asp?tMadhNo=0&tTafsirNo=74&tSoraNo=4&tAyahNo=54&tDisplay=yes&UserProfile=0&LanguageId=2; bold emphasis ours)
(Or are they jealous) nay, they are jealous (of mankind) of Muhammad and his Companions (because of that which Allah of His bounty hath bestowed upon them?) the Scripture, prophethood and marrying many wives. (For We bestowed upon the house of Abraham) David and Solomon ((of old) the Scripture and Wisdom) knowledge, understanding and prophethood, (and We bestowed on them a mighty kingdom) We honoured them with prophethood and Islam and bestowed upon them sovereignty over the Children of Israel. David had 100 legitimate wives, and Solomon had 300 legitimate wives plus 700 concubines. (Tanwîr al-Miqbâs min Tafsîr Ibn ‘Abbâs https://www.altafsir.com/Tafasir.asp?tMadhNo=0&tTafsirNo=73&tSoraNo=4&tAyahNo=54&tDisplay=yes&UserProfile=0&LanguageId=2; bold emphasis mine)
And notice how the Muslim deity utterly shamed his servant, and the son of his servant David, by preventing his wives from conceiving a child except for the one. And even then he only permitted that particular spouse to give birth to a deformed baby, whom Muhammad insultingly called a half-person, e.g., the child wasn’t even good enough to be considered an actual full-blooded human being.
Now if this is how Muhammad’s god treats those closest to him, persons who happened to be his very own prophets and messengers, then imagine how he will treat the rest of his servants? Such a god is not worthy of one’s trust and worship since one can never have any assurance that such a being will never disgrace and humiliate them as well.
Contrast this with the Lord Jesus who promises to never shame or insult anyone who puts their trust and hope in him:
“that if you confess with your mouth Jesus is Lord, and believe in your heart that God has raised Him from the dead, you will be saved, for with the heart one believes unto righteousness, and with the mouth confession is made unto salvation. For the Scripture says, ‘Whoever believes in Him will not be ashamed.’ For there is no distinction between Jew and Greek, for the same Lord over all is generous toward all who call upon Him. For, ‘Everyone who calls on the name of the Lord shall be saved.’” Romans 10:9-13 Modern English Version (MEV)
This is the only God who is worthy of all praise, love, trust, and worship.