Al-Kahf 18:77

Then they went on until they came to the people of a town[37]. They asked its people for food, but they refused to offer them hospitality. They found there a wall that was about to collapse, but he repaired it. Moses said, “If you wished, you could have taken some payment for it.”

[37] Who were extremely mean folk.

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."

77. Then they both proceeded, till, when they came to the people of a town, they asked them for food, but they refused to entertain them. Then they found therein a wall about to collapse and he (Khidr) set it up straight. [Mûsâ (Moses)] said: If you had wished, surely, you could have taken wages for it!"

So they twain journeyed on till, when they came unto the folk of a certain township, they asked its folk for food, but they refused to make them guests. And they found therein a wall upon the point of falling into ruin, and he repaired it. (Moses) said: If thou hadst wished, thou couldst have taken payment for it.