Surah Al-Baqarah 2:90

بِئْسَمَا ٱشْتَرَوْا۟ بِهِۦٓ أَنفُسَهُمْ أَن يَكْفُرُوا۟ بِمَآ أَنزَلَ ٱللَّهُ بَغْيًا أَن يُنَزِّلَ ٱللَّهُ مِن فَضْلِهِۦ عَلَىٰ مَن يَشَآءُ مِنْ عِبَادِهِۦ ۖ فَبَآءُو بِغَضَبٍ عَلَىٰ غَضَبٍ ۚ وَلِلْكَـٰفِرِينَ عَذَابٌ مُّهِينٌ

How wretched is that for which they sold themselves - that they would disbelieve in what Allāh has revealed through [their] outrage that Allāh would send down His favor upon whom He wills from among His servants. So they returned having [earned] wrath upon wrath. And for the disbelievers is a humiliating punishment.

Translation: Saheeh International

Tafsir

Evil is that for which they sell their souls that is their share of the reward in the Hereafter bi’samā ‘evil is that for which’ mā here is an indefinite particle representing ‘a thing’ and constitutes a specification qualifying the subject of the verb bi’s ‘evil is’ the very thing being singled out for criticism; …

Excerpt from Tafsir al-Jalalayn, commentary on 2:90, via Quran.com. The reader has the full commentary and 9 more tafsirs.