عن معاذ بن جبل قال: قال رسول الله صلى الله عليه وسلم: من عير أخاه بذنب لم يمت حتى يعمله (سنن الترمذي، الرقم: 2505)

Hazrat Mu’aaz bin Jabal (radhiyallahu ‘anhu) reports that Rasulullah (sallallahu ‘alaihi wasallam) said, “Whoever taunts (and insults) his (Muslim) brother for a sin (which he has repented from), he will not pass away until he (himself) commits that sin.”