The Prophet صلى الله عليه و سلم said: For him who say: Holy is Allah and to Him belongs all praise, a date tree is planted in Paradise.
The ajwah dates come from Paradise, and they are a remedy for poison.
The Prophet صلى الله عليه و سلم said: When one of you is fasting, he should break his fast with dates; but if he cannot get any, then (he should break his fast) with water, for water is purifying.
– Muslim, Narrated Aisha, r.a.
Narrated Abu Huraira, Trasmitted Tirmidhi, a hasan tradition
Abud Dawud, Narrated Salman ibn Amir
Bukhari 7:663, Narrated Saud