(43) باب الاِسْتِثْنَاءِ .
It was narrated from Abu Hurairah, who attributed it to the Prophet:
"Sulaiman said: 'I will certainly go around to ninety women tonight, each of whom will bear a child who will fight in the cause of Allah.' It was said to him: 'Say: If Allah wills' but he did not say it. He went around to them but none of them bore a child except for one woman who bore half a person." The Messenger of Allah said: "If he had said: 'If Allah wills,' he would not have broken his vow, and this would have been a means to help him to get what he wanted."
Reference: Sunan an-Nasa'i 3856
In-book reference: Book 35, Hadith 96
English translation: Vol. 4, Book 35, Hadith 3887