Musnad Ahmad 942:0

Narrated to us by Muhammad ibn Ja’far, who said: Narrated to us by Shu’bah, from ‘Aasim ibn Bahdalah, from Abu Wa’il, from Kharijah ibn al-Salt, from his paternal uncle, that he came to the Prophet (peace be upon him) and embraced Islam. Then, as he was returning from him, he passed by a people who had a man possessed by madness, shackled in iron. His people said: "We have heard that your companion has brought goodness. Do you have anything with which to cure him?" So I performed Ruqyah upon him with the Opening of the Book (Al-Fatihah), and he was cured. They gave me one hundred sheep. I then came to the Prophet (peace be upon him) and informed him of it. He said: "Did you say anything other than this?" I said: "No." He said: "Take them, for by my life, whoever consumes [earnings] by a false Ruqyah, you have consumed [them] by a true one."