The Prophet ﷺ said, "If somebody takes some ʿAjwa dates every morning, he will not be affected by poison or magic on that day till night." (Another narrator said seven dates).
قَالَ النَّبِيُّ ﷺ مَنِ اصْطَبَحَ كُلَّ يَوْمٍ تَمَرَاتٍ عَجْوَةً لَمْ يَضُرُّهُ سَمٌّ وَلاَ سِحْرٌ ذَلِكَ الْيَوْمَ إِلَى اللَّيْلِ وَقَالَ غَيْرُهُ سَبْعَ تَمَرَاتٍ