Reference: Fataawa Noor ‘alad-Darb q6259 p96 v12
Question: How do good deeds wipe away sins? Is it [as simple as] the sins just go away and the [reward for] good deeds remain?
Response: Yes, this is how Allaah عز و جل said [so]:
{Indeed, good deeds do away with misdeeds} Hood 11:114
So based upon this, if a person does a good deed after he has committed a sin, then [in shaa.-Allaah] it will be [a cause for it being] wiped out, particularly if the good deed is [the act of] repentance from [having fallen into] that sin. Indeed, [sincere] repentance wipes out that which has passed [from sins]; [in this regard], Allaah (Tabaaraka wa تعالى) said:
{Say, “O My servants who have transgressed against themselves [by sinning], do not despair of the mercy of Allaah . Indeed, Allaah forgives all sins. Indeed, it is He who is the Forgiving, the Merciful.”} az-Zumar 39:53
