Surah Ali 'Imran 3:187

وَإِذْ أَخَذَ ٱللَّهُ مِيثَـٰقَ ٱلَّذِينَ أُوتُوا۟ ٱلْكِتَـٰبَ لَتُبَيِّنُنَّهُۥ لِلنَّاسِ وَلَا تَكْتُمُونَهُۥ فَنَبَذُوهُ وَرَآءَ ظُهُورِهِمْ وَٱشْتَرَوْا۟ بِهِۦ ثَمَنًا قَلِيلًا ۖ فَبِئْسَ مَا يَشْتَرُونَ

And [mention, O Muḥammad], when Allāh took a covenant from those who were given the Scripture, [saying], "You must make it clear [i.e., explain it] to the people and not conceal it." But they threw it away behind their backs and exchanged it for a small price. And wretched is that which they purchased.

Translation: Saheeh International

Tafsir

And mention when God made covenant with those who had been given the Scripture that is the pledge taken from them in the Torah ‘You shall expound it read tubayyinunnahu or yubayyinunnahu ‘they shall expound it’ the Book to people and not conceal it’ read taktumūnahu ‘you shall not conceal it’ or yaktumūnahu ‘they …

Excerpt from Tafsir al-Jalalayn, commentary on 3:187, via Quran.com. The reader has the full commentary and 9 more tafsirs.