The Quran

يا أَهلَ الكِتابِ قَد جاءَكُم رَسولُنا يُبَيِّنُ لَكُم كَثيرًا مِمّا كُنتُم تُخفونَ مِنَ الكِتابِ وَيَعفو عَن كَثيرٍ ۚ قَد جاءَكُم مِنَ اللَّهِ نورٌ وَكِتابٌ مُبينٌ

Muhammad Asad

O followers of the Bible! Now there has come unto you Our Apostle, to make clear unto you much of what you have been concealing [from yourselves] of the Bible,¹ and to pardon much. Now there hascome unto you from God a light, and a clear divine writ,

Inasmuch as verses 15-19 are addressed to the Jews and the Christians, the term al-kitab may suitably be rendered here as "the Bible". It is to be borne in mind that the primary meaning of the verb khafiya is "it became imperceptible" or "not apparent" or "obscure" and that the same significance attaches to the transitive form akhfa. There is of course, no doubt that in its transitive form the verb also denotes "he concealed [something]". i.e., from others: but in view of the preceding phrase, "there has come unto you Our Apostle to make clear unto you", it is obvious that what is alluded to in this context is the concealing of something from oneself: in other words, it is a reference to the gradual obscuring, by the followers of the Bible, of its original verities which they are now unwilling to admit even to themselves.