وَاِذْ اَخَذَ اللّٰهُ مِيْثَاقَ الَّذِيْنَ اُوْتُوا الْكِتٰبَ لَتُبَيِّنُنَّهٗ لِلنَّاسِ وَلَا تَكْتُمُوْنَهٗۖ فَنَبَذُوْهُ وَرَاۤءَ ظُهُوْرِهِمْ وَاشْتَرَوْا بِهٖ ثَمَنًا قَلِيْلًا ۗ فَبِئْسَ مَا يَشْتَرُوْنَ ( آل عمران: ١٨٧ )
Wa iz akhazal laahu meesaaqal lazeena ootul Kitaaba latubaiyinunnahoo linnaasi wa laa taktumoona hoo fanabazoohu waraaa'a zuhoorihim washtaraw bihee samanan qaleelan fabi'sa maa yashtaroon (ʾĀl ʿImrān 3:187)
And [mention, O Muhammad], when Allah 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. (Ali 'Imran  : 187)
1 Mufti Taqi Usmani
When Allah took a pledge from those who were given the Book: “You shall make it known to people, and you shall not conceal it,” they threw it away behind their backs, and acquired a small price for it. So, evil is what they acquire.