Quran 21:54 from Surah Al-Anbiyaa on Divine Marvels.
قَالَ لَقَدۡ كُنتُمۡ أَنتُمۡ وَءَابَآؤُكُمۡ فِي ضَلَٰلٖ مُّبِينٖ
English translation: He said Verily you are [you] and your forefathers (were) in an error manifest
Transliteration: qala laqad kuntum antum waabaukum fi dalalin mubinin