Al-Káhf 18:77 فانطلقا حتى اذا اتيا اهل قرية استطعما اهلها فابوا ان يضيفوهما فوجدا فيها جدارا يريد ان ينقض فاقامه قال لو شيت لاتخذت عليه اجرا ٧٧

So they moved on until they came to the people of a town. They asked them for food, but the people refused to give them hospitality. There they found a wall ready to collapse, so the man set it right. Moses protested, “If you wanted, you could have demanded a fee for this.”

So they set out, until when they came to the people of a town, they asked its people for food, but they refused to offer them hospitality. And they found therein a wall about to collapse, so he [i.e., al-Khiḍr] restored it. [Moses] said, "If you wished, you could have taken for it a payment."