I heard Allah’s Messenger (ﷺ) saying, “Whoever takes seven ‘Ajwa dates in the morning will not be effected by magic or poison on that day.”
Reference: Sahih al-Bukhari 5779 Book 76, Hadith 91 Vol. 7, Book 71, Hadith 671
I suffered from an illness. The Messenger of Allah (ﷺ) came to pay a visit to me. He put his hands between my nipples and I felt its coolness at my heart. He said: You are a man suffering from heart sickness. Go to al-Harith ibn Kaladah, brother of Thaqif. He is a man who gives medical treatment. He should take seven ajwah dates of Medina and grind them with their kernels, and then put them into your mouth.
Reference : Sunan Abi Dawud 3875