What did the Prophet Muhammad (peace be upon him) say about the consequence of Solomon, son of David not saying "Allah willing" after expressing his intention to have sexual intercourse with one hundred (or ninety-nine) women?
      Narrated Abu Huraira:                          Allah's Apostle said, "Once Solomon, son of David said, '(By Allah)      Tonight I will have sexual intercourse with one hundred (or      ninety-nine) women each of whom will give birth to a knight who will      fight in Allah's Cause.' On that a (i.e. if Allah wills) but he did      not say, 'Allah willing.' Therefore only one of those women conceived      and gave birth to a half-man. By Him in Whose Hands Muhammad's life      is, if he had said, "Allah willing', (he would have begotten sons) all     of whom would have been knights striving in Allah's Cause."