Quran Al-A'raf 7:70
قَالُوٓاْ أَجِئۡتَنَا لِنَعۡبُدَ ٱللَّهَ وَحۡدَهُۥ وَنَذَرَ مَا كَانَ يَعۡبُدُ ءَابَآؤُنَا فَأۡتِنَا بِمَا تَعِدُنَآ إِن كُنتَ مِنَ ٱلصَّٰدِقِينَ
Translation
They said, "Have you come to us that we should worship Allāh alone and leave what our fathers have worshipped? Then bring us what you promise us, if you should be of the truthful."