Musnad Ahmad 333:22

Makki narrated to us, he said: Yazid ibn Abi Ubayd narrated to us, he said: I saw the mark of a strike on the leg of Salamah, so I said: "O Abu Muslim, what is this strike?" He said: "This is a strike I received on the day of Khaybar." He said: "On the day I received it, the people said: 'Salamah has been struck.' So I was brought to the Messenger of Allah, peace and blessings of Allah be upon him, and he blew upon it three times, and I have not complained of it until this hour."