Holy Qur’an 18:78

So they went on till, when they came to the people of a town, they asked its people for food, but they refused to make them their guests. And they found therein a wall which was about to fall, and he repaired it. Moses said, ‘If thou hadst desired, thou couldst have taken payment for it.’

Translation: Maulawi Sher Ali (Ahmadiyya Muslim Jamaat)

Surah 18: Al-Kahf