Al-An'am 6:53

وَكَذَٰلِكَ فَتَنَّا بَعۡضَهُم بِبَعۡضٖ لِّيَقُولُوٓاْ أَهَـٰٓؤُلَآءِ مَنَّ ٱللَّهُ عَلَيۡهِم مِّنۢ بَيۡنِنَآۗ أَلَيۡسَ ٱللَّهُ بِأَعۡلَمَ بِٱلشَّـٰكِرِينَ 53

And thus We have tried some of them through others that the disbelievers might say, "Is it these whom Allah has favored among us?" Is not Allah most knowing of those who are grateful