Apologies for plagurism. I don't know where I originally got this from so can't give due credit...
How much did Jesus know about the Bible? Not having a handy edition around, he had to rely on his memory. And how well did Jesus recall an account from the text? Let's see one example:
Mark 2:25, 26 "But he said to them: "Have you never once read
The answer would, as we shall see, be "no, I have never read that."
what David did when he fell in need and got hungry, he and the men with him?
This is wrong. David was alone, as the story in 1 Samuel chapter 21 reveals. Ahimelech was suspicious about this fact, asking "Why is it you are by yourself, and no one is with you?" (v1) David actually lied to the priest, claiming to be on a secret mission for the king, when he in reality was a fugitive on the run. David claimed he would meet the other men later: "And I have made an appointment with the young men for such and such a place." (v2)
How he entered into the house of God
Jesus remembers wrong again. David went to Nob (1 Sam. 21:1), and Ahimelech gave him bread that the
priests had earlier removed from the holy table, as verse 6 goes to great pains explaining. What David received, was "the showbread that had been removed from before Jehovah so as to place fresh bread there on the day of its being taken away". Furthermore, the text does not state that David actually ate the bread, although we can probably assume he did.
in the account about Abiathar the chief priest,
Wrong again. It was in the days of Ahimelech the priest (1 Sam. 21:1). Abiathar enters the story in 1 Sam 22:20, as a son of Ahimelech that escapes from the place where Doeg kills Ahimelech and the other priests. 2 Sam 8:17, on the other hand, tells us that Ahimelech was the son of Abiathar. We can understand that Jesus was a bit confused.
and ate the loaves of presentation, which it is not lawful for anybody to eat except the priests,
Actually, there is no such law.
and he gave some also to the men who were with him?""
As we saw above, there was no men with him.
The WTS often makes much of the fact that the New Testament frequently refers to and quotes from Old Testament texts. The fact is, NT writers frequently misquotes, misapplies and are plain wrong about their references. Many NT writers were not very well versed in the Holy Scriptures, and this applies especially to the synoptical gospels, which helps explain blunders as the ones we can see above.