Surah Al-Mujadila 58:3

وَٱلَّذِينَ يُظَـٰهِرُونَ مِن نِّسَآئِهِمْ ثُمَّ يَعُودُونَ لِمَا قَالُوا۟ فَتَحْرِيرُ رَقَبَةٍ مِّن قَبْلِ أَن يَتَمَآسَّا ۚ ذَٰلِكُمْ تُوعَظُونَ بِهِۦ ۚ وَٱللَّهُ بِمَا تَعْمَلُونَ خَبِيرٌ

And those who pronounce ẓihār from their wives and then [wish to] go back on what they said - then [there must be] the freeing of a slave before they touch one another. That is what you are admonished thereby; and Allāh is Aware of what you do.

Translation: Saheeh International

Tafsir

And those who repudiate their wives by zihār and then go back on what they have said instead doing the opposite of this and retaining the woman divorced by zihār that which is contrary to the purpose of zihār in which a woman is characterised as being forbidden — then the penalty for them is the setting free of a …

Excerpt from Tafsir al-Jalalayn, commentary on 58:3, via Quran.com. The reader has the full commentary and 9 more tafsirs.