Musnad Abu Ya'la al-Mawsili 117:137

'Abd al-Rahman ibn Salam al-Jumahi narrated to us, Hammad ibn Salamah narrated to us, from Thabit, from Anas, that Umm Sulaym was with Abu Talhah on the day of Khaybar, and she had a dagger with her. Abu Talhah said to her, "O Umm Sulaym, what is this?" She said, "A dagger I have taken; if any of the polytheists approach me, I will stab him with it." Abu Talhah said, "O Messenger of Allah, do you not hear what Umm Sulaym is saying? She says such and such"—something that escaped Abu Harb—"I will kill them." He said, "Indeed, Allah has sufficed and done well."