Sahih Muslim
The Book on Salutations and Greetings (Kitab As-Salam)
Book Number: 026 / Hadith Number: 5442
'Abd al-Rahman b. al-Aswad reported on the authority of his father: I asked 'A'isha about incantation. She said: Allah's Messenger (may peace be upon him) had granted its sanction to the members of a family of the Ansir for incantation in curing every type of poison.