Musnad Ahmad 33:119

Waki' narrated to us, al-A'mash narrated to us, from Abu Sufyan, from Jabir, who said: My maternal uncle used to perform ruqyah (incantations) for the scorpion sting. When the Messenger of Allah (peace and blessings of Allah be upon him) forbade ruqyah, he came to him and said: "O Messenger of Allah, you have forbidden ruqyah, but I perform ruqyah for the scorpion sting." He said: "Whoever among you is able to benefit his brother, let him do so."