Surah Al-Kahf Verse 77 - English Translation by Muhammad Mahmoud Ghali
Surah Al-Kahfفَٱنطَلَقَا حَتَّىٰٓ إِذَآ أَتَيَآ أَهۡلَ قَرۡيَةٍ ٱسۡتَطۡعَمَآ أَهۡلَهَا فَأَبَوۡاْ أَن يُضَيِّفُوهُمَا فَوَجَدَا فِيهَا جِدَارٗا يُرِيدُ أَن يَنقَضَّ فَأَقَامَهُۥۖ قَالَ لَوۡ شِئۡتَ لَتَّخَذۡتَ عَلَيۡهِ أَجۡرٗا
So they (both) went off until, when they came up to the population of a city, they asked its population for food, yet they refused to receive them hospitably (i.e. as guests). Then they found therein a wall that would have collapsed down, so he set it up. He said, "If you so decided, indeed you could have taken to yourself a reward for it