Musnad Ahmad 307:12

Yunus narrated to us, Shaiban and Husayn narrated to us—in the interpretation of Shaiban—from Qatadah, who said: Anas ibn Malik narrated to us that Abu Talhah said: "Drowsiness overcame us while we were in our ranks on the day of Badr." Abu Talhah said: "And I was among those whom drowsiness overcame on that day, so my sword would fall from my hand and I would take it, and it would fall and I would take it."