ANSWER:

What do you mean by haram money?

If its stolen money then he must return it back to its lawful owner but if its riba money or the like, he can contribute to help the brother.

QUESTION: A brother is collecting money to another brother from Gambia who wants to buy a donkey and a cart so that he in shaa Allah can provide his family. He (i.e the collector) has some haram money and wants to put it into the money that has alhamdullilah been collected. Is this action halal