Sunan Ibn Majah 4244
سنن ابن ماجه#4244Da'ifIt 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:]
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniHasan
Muhammad Fouad Abd al-BaqiHasan
Zubair Ali ZaiDaif
In-book reference: 37:145