Musnad Abu Ya'la al-Mawsili 108:147

Abu Khaythama narrated to us, Jarir narrated to us, from al-A'mash, from Abu Sufyan, from Jabir, who said: There was a man from the Ansar who used to perform ruqyah (incantations) for scorpion stings. The Messenger of Allah (peace and blessings of Allah be upon him) forbade ruqyah. He said: So he said, "O Messenger of Allah, you have forbidden ruqyah, and I used to perform ruqyah for scorpion stings." The Messenger of Allah (peace and blessings of Allah be upon him) said: "Whoever among you is able to benefit his brother, let him do so."