﴿ وَلَقَدْ قَالَ لَهُمْ هَٰرُونُ مِن قَبْلُ يَٰقَوْمِ إِنَّمَا فُتِنتُم بِهِۦ ۖ وَإِنَّ رَبَّكُمُ ٱلرَّحْمَٰنُ فَٱتَّبِعُونِى وَأَطِيعُوٓا۟ أَمْرِى ﴾

“And, indeed, even before [the return of Moses] had Aaron said unto them: "O my people! You are but being tempted to evil by this [idol] -for, behold, your [only] Sustainer is the Most Gracious! Follow me, then, and obey my bidding!"”

And Aaron had certainly said to them beforehand that is before the return of Moses ‘O my people you are only being tested thereby! But truly your Lord is the Compassionate One so follow me in worship of Him and obey my command’ therein.