﴿ وَتَٱللَّهِ لَأَكِيدَنَّ أَصْنَٰمَكُم بَعْدَ أَن تُوَلُّوا۟ مُدْبِرِينَ ﴾

“And [he added to himself.] “By God, I shall most certainly bring about the downfall of your idols as soon as you have turned your backs and gone away!””

Please check ayah 21:63 for complete tafsir.