The Holy Quran 3:177 — Surah Ali 'Imran

Arabic text

إِنَّ ٱلَّذِينَ ٱشْتَرَوُا۟ ٱلْكُفْرَ بِٱلْإِيمَـٰنِ لَن يَضُرُّوا۟ ٱللَّهَ شَيْـًٔا وَلَهُمْ عَذَابٌ أَلِيمٌ

Translation

Verily those who purchase (exchange) kufr (unbelief) for Imaan can never harm (the Deen of) Allaah in the least (even if they have to join forces). They shall have a painful punishment.

Tafsir (excerpt) — Tafsir Usmani

that is, those who have changed their natural disposition to faith and chosen disbelief, whether Jews and Christians, or idolaters, or hypocrites, or anyone else, cannot all together do Allah any harm; rather, they are striking an axe on their own feet with their own hands, the result of which they will have to suffer in the form of a painful punishment.

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