Musnad Ahmad 25:370

Marwan ibn Shuja‘ narrated to us, he said: I do not memorize it except as Salim al-Aftas al-Jazari [from] Ibn ‘Ajlan, he narrated to me from Sa‘id ibn Jubayr, from Ibn ‘Abbas, he said: The Prophet, may Allah bless him and grant him peace, said: "Healing is in three: a drink of honey, an incision of a cupper, and a cauterization by fire; and I forbid my nation from cauterization."