Kharija Ibn salat reported that his paternal uncle went to the Prophet (PBUH) and declared his conversion to Islam. On his way back, his uncle passed by a people who had fettered a lunatic in chains. They said:
We were told that your companion (the Prophet PBUH) has brought good with him, Do you have anything with which to cure our lunatic?
I recited al-Faatiha and he was cured. They gave me one hundred sheep and then approached the Prophet to inform him of it. He asked:
"Did you say anything other than this?"
I replied: "No."
He said: "Take it, for by my life, some would accept in return for a false ruqya, but you have done this with a genuine one,"
According to another narration,
the man cured him by reciting al-Faatiha for three days, day and night; whenever he finished reciting it, he would gather his saliva and spit.