Sunan Ibn Majah, 4244

It was narrated from Abu Hurairah that the Messenger of Allah (ﷺ) said:“When the believer commits sin, a black spot appears on his heart. If he repents and gives up that sin and seeks forgiveness, his heart will be polished. But if (the sin) increases, (the black spot) increases. That is the Ran that Allah mentions in His Book: “Nay! But on their hearts is the Ran (covering of sins and evil deeds) which they used to earn.” [83:]

Rapporté par Abu Hurairah : Le Messager d’Allah (ﷺ) a dit : “Quand le croyant commet un péché, une tache noire apparaît sur son cœur. S’il se repent, arrête ce péché et demande pardon, son cœur sera purifié. Mais si (le péché) augmente, (la tache noire) augmente aussi. C’est cela le Ran dont Allah parle dans Son Livre : “Non ! Mais sur leurs cœurs, il y a le Ran (c’est-à-dire la couverture des péchés et des mauvaises actions) qu’ils ont acquis.” [83:]”