Musannaf Ibn Abi Shayba 36:146

Waki’ narrated to us, he said: Isra’il narrated to us, from Simak, from Mus’ab bin Sa’d, from his father, who said: I obtained a sword on the day of Badr, and it pleased me, so I said: "O Messenger of Allah, grant it to me." Then was revealed: "They ask you about the spoils of war," to the end of the verse.