Sahih al-Bukhari 5736
Narrated Abu Sa`id Al-Khudri:
Some of the companions of the Prophet (ﷺ) came across a tribe amongst the tribes of the Arabs, and that 
tribe did not entertain them. While they were in that state, the chief of that tribe was bitten by a snake 
(or stung by a scorpion). They said, (to the companions of the Prophet (ﷺ) ), "Have you got any medicine 
with you or anybody who can treat with Ruqya?" The Prophet's companions said, "You refuse to 
entertain us, so we will not treat (your chief) unless you pay us for it." So they agreed to pay them a 
flock of sheep. One of them (the Prophet's companions) started reciting Surat-al-Fatiha and gathering 
his saliva and spitting it (at the snake-bite). The patient got cured and his people presented the sheep 
to them, but they said, "We will not take it unless we ask the Prophet (whether it is lawful)." When 
they asked him, he smiled and said, "How do you know that Surat-al-Fatiha is a Ruqya? Take it (flock 
of sheep) and assign a share for me."
حَدَّثَنِي مُحَمَّدُ بْنُ بَشَّارٍ، حَدَّثَنَا غُنْدَرٌ، حَدَّثَنَا شُعْبَةُ، عَنْ أَبِي بِشْرٍ، عَنْ أَبِي الْمُتَوَكِّلِ، عَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ ـ رضى الله عنه ـ أَنَّ نَاسًا مِنْ أَصْحَابِ النَّبِيِّ صلى الله عليه وسلم أَتَوْا عَلَى حَىٍّ مِنْ أَحْيَاءِ الْعَرَبِ فَلَمْ يَقْرُوهُمْ، فَبَيْنَمَا هُمْ كَذَلِكَ إِذْ لُدِغَ سَيِّدُ أُولَئِكَ فَقَالُوا هَلْ مَعَكُمْ مِنْ دَوَاءٍ أَوْ رَاقٍ فَقَالُوا إِنَّكُمْ لَمْ تَقْرُونَا، وَلاَ نَفْعَلُ حَتَّى تَجْعَلُوا لَنَا جُعْلاً‏.‏ فَجَعَلُوا لَهُمْ قَطِيعًا مِنَ الشَّاءِ، فَجَعَلَ يَقْرَأُ بِأُمِّ الْقُرْآنِ، وَيَجْمَعُ بُزَاقَهُ، وَيَتْفِلُ، فَبَرَأَ، فَأَتَوْا بِالشَّاءِ، فَقَالُوا لاَ نَأْخُذُهُ حَتَّى نَسْأَلَ النَّبِيَّ صلى الله عليه وسلم فَسَأَلُوهُ فَضَحِكَ وَقَالَ ‏
"‏ وَمَا أَدْرَاكَ أَنَّهَا رُقْيَةٌ، خُذُوهَا، وَاضْرِبُوا لِي بِسَهْمٍ ‏"‏‏.‏