Question
Some people donated money to treat a sick person. After the treatment was over, there was a sum of money left enough for him to perform ‘Umrah. Is it permissible for him to perform ‘Umrah with that money?
Answer
All perfect praise be to Allah, the Lord of the worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His Slave and Messenger.
If the donors intended to transfer the ownership of money to that sick person and console him with it, he is permitted to perform ‘Umrah with the rest of the money after treatment. But if they intended that he uses the money for treatment only, he is not allowed to spend it in any other purpose unless he seeks their permission: If they allow him to perform ‘Umrah with the money, it is permissible for him to do so, otherwise, he is required to give the money back to them.
Allah Knows best.