Musnad Abu Ya'la al-Mawsili 109:8

Narrated to us Ishaq, narrated to us Jarir, from al-A'mash, from Abu Sufyan, from Jabir, who said: My maternal uncle from the Ansar used to perform ruqyah (incantation) for the fever (or venomous sting). The Messenger of Allah (peace be upon him) said: "Present it to me." So he presented it to him, and the Messenger of Allah (peace be upon him) said: "There is no harm in this; this is from the covenants."