Al An'am, 53 Ayah
6:53
وَكَذَٰلِكَ فَتَنَّا بَعۡضَهُم بِبَعۡضٖ لِّيَقُولُوٓاْ أَهَٰٓؤُلَآءِ مَنَّ ٱللَّهُ عَلَيۡهِم مِّنۢ بَيۡنِنَآۗ أَلَيۡسَ ٱللَّهُ بِأَعۡلَمَ بِٱلشَّٰكِرِينَ ٥٣
Wa Kadhalika Fatannā Ba`đahum Biba`đin Liyaqūlū 'Ahā'uulā' Manna Al-Lahu `Alayhim Min Bayninā ۗ 'Alaysa Al-Lahu Bi'a`lama Bish-Shākirīna
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?