Sahih Muslim Book 26, Hadith Number 5452.

Chapter : The excellence of curing (with the help of incantation) the influence of the evil eye and small pustules and the poison (especially of snake and scorpion).

Jabir b. ‘Abdullah reported that Allah’s Apostle (may peace be upon him) granted a special sanction for incantation in case of the snake poison to a tribe of ‘Amr. Abu Zubair said: I heard Jabir b. ‘Abdullah as saying that the scorpion stung one of us as we were sitting with Allah’s Messenger (may peace upon him). A person said: Allah’s Messenger, I use incantation (for curing the effect of sting), whereupon he said: He who is competent amongst you to benefit his brother should do so.