وَكَذَٰلِكَ فَتَنَّا بَعْضَهُمْ بِبَعْضٍ لِيَقُولُوا أَهَٰؤُلَاءِ مَنَّ اللَّهُ عَلَيْهِمْ مِنْ بَيْنِنَا ۗ أَلَيْسَ اللَّهُ بِأَعْلَمَ بِالشَّاكِرِينَ 53
Thus did We try some of them by comparison with others, that they should say: "Is it these then that Allah hath favoured from amongst us?" Doth not Allah know best those who are grateful?