Taha 20:90

وَلَقَدۡ قَالَ لَهُمۡ هَٰرُونُ مِن قَبۡلُ يَٰقَوۡمِ إِنَّمَا فُتِنتُم بِهِۦۖ وَإِنَّ رَبَّكُمُ ٱلرَّحۡمَٰنُ فَٱتَّبِعُونِي وَأَطِيعُوٓاْ أَمۡرِي 90

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