Surah Taha — Ayah 90 (20:90)
وَلَقَدۡ قَالَ لَهُمۡ هَٰرُونُ مِن قَبۡلُ يَٰقَوۡمِ إِنَّمَا فُتِنتُم بِهِۦۖ وَإِنَّ رَبَّكُمُ ٱلرَّحۡمَٰنُ فَٱتَّبِعُونِي وَأَطِيعُوٓاْ أَمۡرِي ٩٠
English translation (Saheeh International)
And Aaron had already told them before [the return of Moses], "O my people, you are only being tested by it, and indeed, your Lord is the Most Merciful, so follow me and obey my order."
Brief commentary
Aaron had said to them before Moses returned to them: “The making of the calf from gold and its mooing are only to test you, to distinguish the believer from the disbeliever. And your Lord, O people, is Allah, so follow me by worshipping Him alone and obey my command to leave worshipping others besides Him”.