The Messenger of Allah ﷺ said, "Sulayman bin Dawud said, 'Tonight I will go around to ninety wives, each of whom will bear a horseman who will fight in the cause of Allah.'His companion said to him, 'Say, if Allah wills.'But he did not say, 'If Allah wills.' He went around to all of them, yet none of them conceived except one woman, who gave birth to half a man.By the One in whose hand is Muhammad's soul, had he said, 'If Allah wills,' they would all have fought in the cause of Allah as horsemen."
عن رسول الله ﷺ قال: قال سليمان بن داود لأطوفن الليلة على تسعين امرأة كلهن تأتي بفارس يجاهد في سبيل الله، فقال له صاحبه: قل إن شاء الله فلم يقل إن شاء الله فطاف عليهن جميعا، فلم تحمل منهن إلا امرأة واحدة جاءت بشق رجل، وأيم الذي نفس محمد بيده لو قال: إن شاء الله لجاهدوا في سبيل الله فرسانا أجمعون.
Tahawi narrated it in Sharh Mushkil (1925) from Rabi Muradi, from Shuayb bin Layth, from Layth, from Jafar bin Rabia, from Abdul-Rahman bin Hurmuz, who said, I heard Abu Hurairah relate from the Messenger of Allah ﷺ saying, and he mentioned it. Its isnad is sahih. Bukhari mentioned it in the Book of Jihad (2819) as a suspended narration from Layth, with the same wording.