Musannaf Ibn Abi Shayba 36:466

Hashim ibn al-Qasim narrated to us, he said: ‘Ikrimah ibn ‘Ammar narrated to us, he said: Iyas ibn Salamah narrated to us, he said: My father narrated to me, he said: I went on a military expedition with the Messenger of Allah (may Allah bless him and grant him peace) against Hawazin. While we were eating our midday meal—and most of us were on foot, and among us were the weak—a man came on a red camel. He pulled a leather strap from his saddlebag and hobbled his camel with it. He was a young man. Then he came to eat with the people. When he saw their weakness and the scarcity of their mounts, he went out running toward his camel, untied it, made it kneel, sat upon it, and then went out galloping it. A man from Aslam, one of the companions of the Prophet (may Allah bless him and grant him peace), followed him on a grey she-camel, which was the best mount among the people. He sat [on it] and followed him. I went out running, and I caught up with him. The head of the she-camel was at the hip of the camel, and I was at the hip of the she-camel. I had moved ahead until I took hold of the nose-rein of the camel and made it kneel. When it placed its knees on the ground, I drew my sword and struck his head, and it fell off. I came with his mount and what was upon it, leading it. The Messenger of Allah (may Allah bless him and grant him peace) met me, coming [toward us], and said: "Who killed the man?" They said: "Ibn al-Akwa'." So he granted him his spoils.