Praise be to Allaah.
If he knew at the time of earning haraam money that it was haraam, then it does not become
permissible for him when he repents, rather he has to get rid of it by spending it on charitable causes.
And Allaah is the Source of strength.
Fataawa al-Lajnah al-Daa’imah li’l-Buhooth wa’l-Ifta’, 14/32.