Musnad Abu Ya'la al-Mawsili 117:236

Zuhayr narrated to us, Affan narrated to us, Hammad narrated to us, Thabit informed us, from Anas bin Malik, that Umm Sulaym was with Abu Talhah on the day of Hunayn, and Umm Sulaym had a dagger with her. Abu Talhah said, "What is this with you, O Umm Sulaym?" She said, "I took it so that if any of the disbelievers approach me, I will rip open his belly with it." Abu Talhah said, "O Prophet of Allah, do you not hear what Umm Sulaym is saying? She says such and such." She said, "O Messenger of Allah, kill those who are behind us from the Tulaqa' (those freed at the conquest of Mecca), for they fled from you, O Messenger of Allah." He said, "O Umm Sulaym, indeed Allah has sufficed and done well."