عن أبي هريرة أن رسول الله صلى الله عليه وسلم قال من صلى علي واحدة صلى الله عليه عشرا (صحيح مسلم #408)

Hazrat Abu Hurairah (radhiyallahu ‘anhu) reports that Rasulullah (sallallahu ‘alaihi wasallam) said, “Whoever send salutations upon me once, Allah Ta‘ala will send salutations (i.e. reward him and shower His mercy) upon him ten times.”