al-Zuhri ابن شهاب الزهري‎, محمد بن مسلم · Medicine (Kitab Al-Tibb)

He who has a morning meal of seven ‘Ajwah dates will not suffer from any harm that day through poison or magic.

A man from Aslam tribe said: I was sitting with the Messenger of Allah (ﷺ). A man from among his Companions came and said: Messenger of Allah! I have been stung last night, and I could not sleep till morning. He asked: What was that? He replied: A scorpion. He said: Oh, had you said in the evening: "I take refuge in the perfect words of Allah from the evil of what He created," nothing would have harmed you, Allah…

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…