Musnad Ahmad 1365

It was narrated that ‘Ali (رضي الله عنه) said: The Messenger of Allah (ﷺ) said: “Whoever commits a sin in this world and is punished for it, Allah is too just to repeat His punishment for His slave, And whoever commits a sin in this world and Allah conceals it for him and pardons him, Allah is too kind to retract any pardon that He has granted."