Chapter: Saying: "If Allah wills" when swearing oaths and at other times

Abu Hurairah (RA) reported that (Hadrat) Sulaiman had sixty wives. He (one day) said: I will visit each one of them every night, and every one of them will become pregnant and give birth to a male child who will be a horseman and fight in the cause of Allah. But (it so happened) that none of them became pregnant except one, but she gave birth to an incomplete child. Thereupon Allah's Messenger (ﷺ) said: Had he said Insha' Allah (if God so wills), then every one of them would have given birth to a child who would have been a horseman and fought in the cause of Allah

Abu Hurairah (RA) reported Allah's Prophet (ﷺ) as saying that Sulaiman bin Dawud, the Apostle of Allah (ﷺ) , observed: I will have an intercourse with seventy wives during the night; all of them will give birth to a male child who will fight in the cause of Allah. His companion or the angles said to him: Say, "If God wills." But he (Hadrat Sulaimin) did not say so, and he forgot it. And none of his wives gave birth to a child, but one who gave birth to a premature child. Allah's Messenger (ﷺ) said: Had he said Insha' Allah (if God so will) he would not have failed and his desire would have been materialised.

Abu Hurairah (RA) reported this hadith from the Apostle of Allah (ﷺ) through another chain of transmitters.

Abu Hurairah (RA) reported that Sulaiman bin Dawud said: I will certainly have intercourse with seventy wives during the night, and every wife amongst them will give birth to a child, who will fight in the cause of Allah. It was said to him: Say: "Insha' Allah" (God willing), but he did not say so and forgot it. He went round them but none of them give birth to a child except one woman and that too was an incomplete person. Upon this Allah's Messenger (ﷺ) said: If he had said "Insha' Allah" he would not have failed, and his desire must have been fulfilled.

Abu Hurairah (RA) reported Allah's Apostle (ﷺ) as saying that Sulaiman bin Dawud (once) said: I will go round in the night to my ninety wives, and every one of them will give birth to a child (who will grow up) as a horseman and fight in the cause of Allah His companions said to him: Say "Insha' Allah." but he did not say Insha' Allah. He went round all of them but none of them became pregnant but one, and she gave birth to a premature child. And by Him in Whose hand is the life of Muhammad, if he had said Insha' Allah (his wives would have given birth to the children who would all have grown up into horsemen and fought in the way of Allah).

This hadith has been narrated on the authority of Abu Zinad with the same chain of transmitters with a variation of (these words): "Every one of them giving birth to a child, who would have fought in the cause of Allah."