Quran 6:53 from Surah Al-An'aam on Divine Marvels.
وَكَذَٰلِكَ فَتَنَّا بَعۡضَهُم بِبَعۡضٖ لِّيَقُولُوٓاْ أَهَٰٓؤُلَآءِ مَنَّ ٱللَّهُ عَلَيۡهِم مِّنۢ بَيۡنِنَآۗ أَلَيۡسَ ٱللَّهُ بِأَعۡلَمَ بِٱلشَّٰكِرِينَ
English translation: And thus We try some of them with others that they say Are these (whom has been) favored (by) Allah [upon them] from among us is not Allah most knowing of those who are grateful
Transliteration: wakadhalika fatanna ba'dahum biba'din liyaqulu ahaulai manna al-lahu alayhim min baynina alaysa al-lahu bi-a'lama bil-shakirina