Sayyiduna Abu Jum'ah al-Ansari Junayd bin Sabu' (may Allah be pleased with him) narrates: "At the beginning of the day I fought against the Prophet (peace and blessings be upon him) as a disbeliever, and at the end of the day I fought alongside him (peace and blessings be upon him) as a Muslim. We were three men and nine women, and it was about us that this verse was revealed: 'And if it were not for believing men and believing women' [Surah al-Fath: 25]."
Hadith Referenceالمعجم الكبير للطبراني / باب الحاء / 3530