وَكَذَلِكَ فَتَنَّا بَعْضَهُم بِبَعْضٍ لِّيَقُولُوا أَهَؤُلَاءِ مَنَّ اللَّهُ عَلَيْهِم مِّن بَيْنِنَا أَلَيْسَ اللَّهُ بِأَعْلَمَ بِالشَّاكِرِينَ

Thus do We test them by means of one another so that they should say, ‘Are these the ones whom Allah has favoured from among us?!’ Does not Allah know best the grateful?!