Musnad Ahmad 32:118

Ibn Abi ‘Adi narrated to us, from Humayd, from Anas, who said: When the Muslims were defeated on the day of Hunayn, Umm Sulaym called out: "O Messenger of Allah, kill those who fled after us!" The Messenger of Allah, peace and blessings of Allah be upon him, said: "O Umm Sulaym, Allah, the Almighty and Majestic, has sufficed." He said: Then Abu Talha came to her, and she had a dagger with her. He said: "What is this, O Umm Sulaym?" She said: "If any of the polytheists come near me, I will stab him with it." He said: Then Abu Talha said: "O Messenger of Allah, look at what Umm Sulaym is saying."