“The Messenger of Allah (ﷺ) said to me: ‘O ‘Aishah, beware of (evil) deeds that are regarded as insignificant, for they have a pursuer from Allah. (i.e. accountability).”
Sunan Ibn Majah Book 37, Hadith 144
← Previous Hadith “We said: ‘O Messenger of Allah, will we be taken to task for what we did in the Ignorance period?’ The Messenger of Allah (ﷺ) said: ‘Whoever does good in Islam (i.e., after becoming a Muslim) he will not be taken to task for what he did in the Ignorance period, but whoever does evil (i.e., after entering Islam) he will be taken to task for both the former and the latter.’”

Sunan Ibn Majah Book 37, Hadith 143 Next Hadith → “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.”

Sunan Ibn Majah Book 37, Hadith 145