Surah Al-Anbya 21:57

وَتَٱللَّهِ لَأَكِيدَنَّ أَصْنَـٰمَكُم بَعْدَ أَن تُوَلُّوا۟ مُدْبِرِينَ

And [I swear] by Allāh, I will surely plan against your idols after you have turned and gone away."

Translation: Saheeh International

Tafsir

And by God I shall devise a stratagem against your idols after you have gone away with your backs turned’.

Excerpt from Tafsir al-Jalalayn, commentary on 21:57, via Quran.com. The reader has the full commentary and 9 more tafsirs.