Mishkat al-Masabih 2985

Ibn 'Abbas said some of the Prophet's companions passed a watering-place where there was one who had been stung by a scorpion or bitten by a snake. One of the inhabitants of the watering-place accosted them and asked whether anyone among them could apply a charm, for at the watering-place there was a man who had been stung by a scorpion or bitten by a snake. One of them went and recited Fatihat al-Kitab in return for some sheep, and he was cured; but when he brought the sheep to his companions they disapproved of that saying, “You have taken payment for God’s Book.” When they came to Medina and told God’s Messenger that he had taken payment for God's Book, he replied, “The most worthy thing for which you have taken payment is God’s Book." Bukhari transmitted it. In a version he said, “You have done right. Divide them and give me a share along with you."