Quran 6:23 from Surah Al-An'aam on Divine Marvels.
ثُمَّ لَمۡ تَكُن فِتۡنَتُهُمۡ إِلَّآ أَن قَالُواْ وَٱللَّهِ رَبِّنَا مَا كُنَّا مُشۡرِكِينَ
English translation: Then not will be (for) them a plea except that they say By Allah our Lord not we were those who associated others (with Allah)
Transliteration: thumma lam takun fit'natuhum illa an qalu wal-lahi rabbina ma kunna mush'rikina