Musannaf Ibn Abi Shayba 28:85

Waki’ narrated to us, he said: My father and Isra’il narrated to us, from Abu Ishaq, from Abu ‘Ubaydah, who said: ‘Abdullah said: I reached Abu Jahl on the day of Badr, and his leg had been struck, and he was fallen, and he was defending people away from him with his sword. I said: "Praise be to Allah who has disgraced you, O enemy of Allah! Is he anything but a man whom his people have killed?" I began to strike him with a sword of mine that was of no use, so his hand was hit, and his sword fell out. I took it and struck him with it until he grew cold [i.e., died].