Ruling on taking money in exchange for serving colleagues on a trip

Question:
I and a group of colleagues went on a trip, and they appointed me as the person responsible for holding the funds for this trip. I did what was required of them regarding all the necessities, but in the end, a sum of money remained with me, and they refused to take it from me. Should I give it in charity, or is it mine to dispose of as I wish?

Answer:
If they have permitted you to keep it, then it is yours, and praise be to Allah. You are all one, and as long as they have permitted you to keep it in exchange for the good service and trustworthiness you provided, there is no harm in you disposing of it and benefiting from it, because your brothers in Allah have permitted you to keep it. There is no harm, and praise be to Allah.