Surah An-Nisa 4:15

وَٱلَّـٰتِى يَأْتِينَ ٱلْفَـٰحِشَةَ مِن نِّسَآئِكُمْ فَٱسْتَشْهِدُوا۟ عَلَيْهِنَّ أَرْبَعَةً مِّنكُمْ ۖ فَإِن شَهِدُوا۟ فَأَمْسِكُوهُنَّ فِى ٱلْبُيُوتِ حَتَّىٰ يَتَوَفَّىٰهُنَّ ٱلْمَوْتُ أَوْ يَجْعَلَ ٱللَّهُ لَهُنَّ سَبِيلًا

Those who commit immorality [i.e., unlawful sexual intercourse] of your women - bring against them four [witnesses] from among you. And if they testify, confine them [i.e., the guilty women] to houses until death takes them or Allāh ordains for them [another] way.

Translation: Saheeh International

Tafsir

As for those of your women who commit lewdness adultery call four Muslim men of you to witness against them; and if they witness against them such lewdness then detain them in their houses and prevent them from mixing with people until the angels of death take them or until God appoints for them a way out of it. …

Excerpt from Tafsir al-Jalalayn, commentary on 4:15, via Quran.com. The reader has the full commentary and 9 more tafsirs.