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

Then the two went forth until when they came to a town, they asked its people for food, but they refused to play host to them. They found in that town a wall that was on the verge of tumbling down, and he buttressed it, whereupon Moses said: "If you had wished, you could have received payment for it."