Surah Al-Hashr 59:19

وَلَا تَكُونُوا۟ كَٱلَّذِينَ نَسُوا۟ ٱللَّهَ فَأَنسَىٰهُمْ أَنفُسَهُمْ ۚ أُو۟لَـٰٓئِكَ هُمُ ٱلْفَـٰسِقُونَ

And be not like those who forgot Allāh, so He made them forget themselves. Those are the defiantly disobedient.

Translation: Saheeh International

Tafsir

And do not be like those who forget God those who neglect obedience to Him so that He makes them forget their own souls to forget to send ahead good deeds for its sake. Those — they are the immoral.

Excerpt from Tafsir al-Jalalayn, commentary on 59:19, via Quran.com. The reader has the full commentary and 9 more tafsirs.