Quran 20:90 from Surah Taa-Haa on Divine Marvels.
وَلَقَدۡ قَالَ لَهُمۡ هَٰرُونُ مِن قَبۡلُ يَٰقَوۡمِ إِنَّمَا فُتِنتُم بِهِۦۖ وَإِنَّ رَبَّكُمُ ٱلرَّحۡمَٰنُ فَٱتَّبِعُونِي وَأَطِيعُوٓاْ أَمۡرِي
English translation: And verily (had) said to them Harun before before O my people Only you are being tested by it and indeed your Lord (is) the Most Gracious so follow me and obey my order
Transliteration: walaqad qala lahum harunu min qablu yaqawmi innama futintum bihi wa-inna rabbakumu al-rahmanu fa-ittabi'uni wa-ati'u amri