Quran 3:70 from Surah Aal-i-Imraan on Divine Marvels.
يَٰٓأَهۡلَ ٱلۡكِتَٰبِ لِمَ تَكۡفُرُونَ بِـَٔايَٰتِ ٱللَّهِ وَأَنتُمۡ تَشۡهَدُونَ
English translation: O People (of) the Book! Why do you deny [in] the Signs (of) Allah while you bear witness
Transliteration: yaahla al-kitabi lima takfuruna biayati al-lahi wa-antum tashhaduna