Surah Ali 'Imran — Ayah 63 (3:63)
فَإِن تَوَلَّوۡاْ فَإِنَّ ٱللَّهَ عَلِيمُۢ بِٱلۡمُفۡسِدِينَ ٦٣
English translation (Saheeh International)
But if they turn away, then indeed - Allāh is Knowing of the corrupters.
Brief commentary
If they turn away from what you have brought and do not follow you, then it is because they are corrupt. Allah knows those who cause corruption in the earth and He will recompense them for that.