Quran 7:70 from Surah Al-A'raaf on Divine Marvels.
قَالُوٓاْ أَجِئۡتَنَا لِنَعۡبُدَ ٱللَّهَ وَحۡدَهُۥ وَنَذَرَ مَا كَانَ يَعۡبُدُ ءَابَآؤُنَا فَأۡتِنَا بِمَا تَعِدُنَآ إِن كُنتَ مِنَ ٱلصَّٰدِقِينَ
English translation: They said Have you come to us that we (should) worship Allah Alone and we forsake what used to worship our forefathers Then bring us of what you promise us if you are of the truthful
Transliteration: qalu aji'tana lina'buda al-laha wahdahu wanadhara ma kana ya'budu abauna fatina bima ta'iduna in kunta mina al-sadiqina