Surah Taha 20:85

قَالَ فَإِنَّا قَدْ فَتَنَّا قَوْمَكَ مِنۢ بَعْدِكَ وَأَضَلَّهُمُ ٱلسَّامِرِىُّ

[Allāh] said, "But indeed, We have tried your people after you [departed], and the Sāmirī has led them astray."

Translation: Saheeh International

Tafsir

But those he supposed to be following him had remained behind for He exalted be He said ‘Indeed We tried your people after you that is after your departure from them and the Samaritan led them astray’ so they took to worshipping the golden calf.

Excerpt from Tafsir al-Jalalayn, commentary on 20:85, via Quran.com. The reader has the full commentary and 9 more tafsirs.