Sahih Muslim | Book 15 | Hadith Number 4066

Narrated by Abu Huraira
Abu Huraira 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 (may peace be upon him) 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