Surah Al-Mujadila 58:9

يَـٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُوٓا۟ إِذَا تَنَـٰجَيْتُمْ فَلَا تَتَنَـٰجَوْا۟ بِٱلْإِثْمِ وَٱلْعُدْوَٰنِ وَمَعْصِيَتِ ٱلرَّسُولِ وَتَنَـٰجَوْا۟ بِٱلْبِرِّ وَٱلتَّقْوَىٰ ۖ وَٱتَّقُوا۟ ٱللَّهَ ٱلَّذِىٓ إِلَيْهِ تُحْشَرُونَ

O you who have believed, when you converse privately, do not converse about sin and aggression and disobedience to the Messenger but converse about righteousness and piety. And fear Allāh, to whom you will be gathered.

Translation: Saheeh International

Tafsir

O you who believe if you do talk in secret then do not talk in secret sinfully and in enmity and disobedience to the Messenger but talk secretly in piety and fear of God. And fear God to Whom you will be gathered.

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