(3) باب كَيْفَ كَانَتْ يَمِينُ النَّبِيِّ صلى الله عليه وسلم
Narrated Abu Huraira:
Allah's Messenger (ﷺ) said, "(The Prophet) Solomon once said, 'Tonight I will sleep with ninety women, each of whom will bring forth a (would-be) cavalier who will fight in Allah's Cause." On this, his companion said to him, "Say: Allah willing!" But he did not say Allah willing. Solomon then slept with all the women, but none of them became pregnant but one woman who later delivered a halfman. By Him in Whose Hand Muhammad's soul is, if he (Solomon) had said, 'Allah willing' (all his wives would have brought forth boys) and they would have fought in Allah's Cause as cavaliers. "
Reference: Sahih al-Bukhari 6639
In-book reference: Book 83, Hadith 18
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 8, Book 78, Hadith 634