What is the ruling on one who spent on his study expenses from ill-gotten wealth while knowing that, and what is the ruling on the certificate obtained, and is it permissible to work with it, and is the salary resulting from working with it lawful or unlawful?

What has been mentioned does not affect the permissibility of benefiting from the certificate, working with it, or the earnings from that work, provided the work itself is permissible. The clarification on how to absolve oneself of unlawfully acquired wealth is detailed in Fatwa no. 67721.