50. How can I convert haram (unlawful) money to halal (lawful)?

If by haram money you mean money that you have usurped from someone, then you must return it and apologise to the one from whom you have taken it. If that person has passed away or there is no means of doing so, they should seek repentance and ask for forgiveness from God. You must pray and give away the money in charity. You must not keep the money with yourself.