2-75
Are you then hopeful that they will believe for your sake? And indeed a party from among them heard the word of Allah, then after understanding it, they altered it, and they know (this).
Allah (SWT) is giving a hint to Muslims that the Jews will not believe just for their sake. Some of them had heard the word of Allah (SWT) in the form of Torah, Zuboor and the Injeel and understood it. They knew from these sources about Prophet Muhammed (PBH) but they altered this information. Some of the Jews might have told the Muslims that they believed in the Prophethood of Muhammed (PBH) because it was written in their books. This might have prompted other Jews to object, because they felt that Muslims would argue with them on the day of resurrection before Allah (SWT) that even after having information about Prophet Muhammed (PBH) they did not accept him as the last messenger of Allah and the Quran revealed to him as the final message of Allah (SWT). Therefore Allah (SWT) is informing them that whether they hide or proclaim He knows everything.
2-78
And among them are the unlettered who do not (even) know (what is written in) the book (their religion is nothing) but hearsay (idle tales or lies) and they do nothing but guess. (P ½)
“Some of the Jews did not even know how to read. Their religion was not based on their Divine book but on hearsay and guess work. Here is a clear hint to us that religion should be based on the Divine book and the teachings of the messenger of Allah i.e. The Quran and teachings of Prophet Muhammed (PBH). There were others who wrote the book with their hands and claimed that it was from Allah (SWT), this they did for pity gains. Allah (SWT) declares that theirs’will be a sorrowful state because of such acts. Without any authority from Allah (SWT) they made a statement that the fire would afflict them only for a counted number of days. In reply to this Allah (SWT) states that if they had made an agreement to this effect with Him then. He will not go against it, and questions them on their committing on His behalf without any knowledge. Then He gives His decision whoever earns evil and is encompassed by his misdeeds will be the inhabitant of the fire, staying in it, and those who believe and act in accordance with the instructions given in the Divine book and by the messenger of Allah, those will be the residents of paradise, they will stay therein.”