Sunan an-Nasa'i 3856

Al-ʿAbbas ibn ʿAbd al-ʿAzim reported to us; he said: ʿAbd al-Razzaq narrated to us; he said: Maʿmar informed us, from Ibn Tawus, from his father, from Abu Hurayrah, who traced this report to the Prophet, peace and blessings be upon him: ‘Sulayman said, “Tonight I will certainly go to ninety women, each of whom will give birth to a boy who will fight in the cause of Allah.” He was told, “Say, ‘If Allah wills.’” But he did not say it. He went to them, but only one woman gave birth, to half a person.’ The Messenger of Allah said: ‘Had he said, “If Allah wills,” he would not have broken his oath, and that would have helped him attain what he wanted.’