Surah Al-Baqarah 2:256

لَآ إِكْرَاهَ فِى ٱلدِّينِ ۖ قَد تَّبَيَّنَ ٱلرُّشْدُ مِنَ ٱلْغَىِّ ۚ فَمَن يَكْفُرْ بِٱلطَّـٰغُوتِ وَيُؤْمِنۢ بِٱللَّهِ فَقَدِ ٱسْتَمْسَكَ بِٱلْعُرْوَةِ ٱلْوُثْقَىٰ لَا ٱنفِصَامَ لَهَا ۗ وَٱللَّهُ سَمِيعٌ عَلِيمٌ

There shall be no compulsion in [acceptance of] the religion. The right course has become distinct from the wrong. So whoever disbelieves in ṭāghūt and believes in Allāh has grasped the most trustworthy handhold with no break in it. And Allāh is Hearing and Knowing.

Translation: Saheeh International

Tafsir

There is no compulsion in entering into religion. Rectitude has become clear from error that is say through clear proofs it has become manifest that faith is rectitude and disbelief is error this was revealed concerning the Ansār of Medina who tried to compel their sons to enter into Islam; …

Excerpt from Tafsir al-Jalalayn, commentary on 2:256, via Quran.com. The reader has the full commentary and 9 more tafsirs.