وَلَا تَلْبِسُوا الْحَقَّ بِالْبَاطِلِ وَتَكْتُمُوا الْحَقَّ وَأَنتُمْ تَعْلَمُونَ
Do not mix the truth with falsehood, nor conceal the truth while you know.
Agha Ali Puya Commentary
Commentary on Quran 2:42
[Pooya/Ali Commentary 2:42] It refers to the scriptures, revealed prior to the Quran, which had been profusely tampered with, restyled and disguised by the Christians. Many rabbis knew the true text of the scriptures in the time of the Holy Prophet but concealed the truth, and when a few less careful, now and then, quoted them as mentioned in verse 76 of this surah they were rebuked for giving secret information to the Muslims. (see commentary for verse 4)