I heard Allah's Messenger (ﷺ) saying, "If Somebody takes seven 'Ajwa dates in the morning, neither magic nor poison will hurt him that day."
Sahih al-Bukhari Book 76, Hadith 83
← Previous Hadith The Prophet (ﷺ) said, "If somebody takes some `Ajwa dates every morning, he will not be affected by poison or magic on that day till night." (Another narrator said seven dates).

Sahih al-Bukhari Book 76, Hadith 82 Next Hadith → The Prophet (ﷺ) said, 'No 'Adwa (i.e. no contagious disease is conveyed to others without Allah's permission); nor (any evil omen in the month of) Safar; nor Hama" A bedouin said, "O Allah's Messenger (ﷺ)! What about the camels which, when on the sand (desert) look like deers, but when a mangy camel mixes with them they all get infected with mange?" On that Allah s Apostle said, "Then who conveyed the (mange) disease to the first (mangy) camel?"

Sahih al-Bukhari Book 76, Hadith 84