اقرأ وتدبر الآية 2217 من سورة سُورَةُ الكَهۡفِ: فَانْطَلَقَا حَتَّىٰ إِذَا أَتَيَا أَهْلَ قَرْيَةٍ اسْتَطْعَمَا أَهْلَهَا فَأَبَوْا أَنْ يُضَيِّفُوهُمَا فَوَجَدَا فِيهَا جِدَارًا يُرِيدُ أَنْ يَنْقَضَّ فَأَقَامَهُ ۖ قَالَ لَوْ شِئْتَ لَاتَّخَذْتَ عَلَيْهِ أَجْرًا
فَانْطَلَقَا حَتَّىٰ إِذَا أَتَيَا أَهْلَ قَرْيَةٍ اسْتَطْعَمَا أَهْلَهَا فَأَبَوْا أَنْ يُضَيِّفُوهُمَا فَوَجَدَا فِيهَا جِدَارًا يُرِيدُ أَنْ يَنْقَضَّ فَأَقَامَهُ ۖ قَالَ لَوْ شِئْتَ لَاتَّخَذْتَ عَلَيْهِ أَجْرًا
And so the two went on, till, when they came upon some village people, they asked them for food; but those [people] refused them all hospitality. And they saw in that (village] a wall which was on the point of tumbling down, and [the sage] rebuilt it [whereupon Moses] said: "Hadst thou so wished, surely thou couldst [at least] have obtained some payment for it?"