We proceeded from the Messenger of Allah ﷺ and came to a clan of the Arabs. They said: We have been told that you have brought what is good from this man. Have you any medicine or a charm, for we have a lunatic in chains? We said: Yes. Then they brought a lunatic in chains. He said: I recited Surat al-Fatihah over him for three days, morning and evening. Whenever I finished it, I would collect my saliva and spit it out, and he seemed as if he were set free from a bond. He said: They gave me some payment, but I said: No, not until I ask the Messenger of Allah ﷺ. He (the Prophet) said: Accept it, for, by my life, some accept it for a worthless charm, but you have done so for a genuine one. (Using translation from Abū Dāʾūd 3901)   

أَقْبَلْنَا مِنْ عِنْدِ النَّبِيِّ ﷺ فَأَتَيْنَا عَلَى حَيٍّ مِنَ الْعَرَبِ فَقَالُوا هَلْ عِنْدَكُمْ دَوَاءٌ أَوْ رُقْيَةٌ؟ فَإِنَّ عِنْدَنَا مَعْتُوهًا فِي الْقُيُودِ فَجَاءُوا بِمَعْتُوهٍ فِي الْقُيُودِ فَقَرَأْتُ عَلَيْهِ فَاتِحَةَ الْكِتَابِ ثَلَاثَةَ أَيَّامٍ غُدْوَةً وَعَشِيَّةً أَجْمَعُ بُزَاقِي وَأَتْفِلُ فَكَأَنَّمَا أُنْشِطَ مِنْ عِقَالٍ فَأَعْطَوْنِي جُعْلًا فَقُلْتُ لَا فَقَالُوا سَلِ النَّبِيَّ ﷺ فَسَأَلْتُهُ فَقَالَ «كُلْ فَلَعَمْرِي مَنْ أَكَلَ بِرُقْيَةِ بَاطِلٍ فَقَدْ أَكَلْتَ بِرُقْيَةِ حَقٍّ»