The books of the Natsarim are a few books that are known for carying more of the teachings of Jesus and unlike the New Testament Apochrypa books. In the book of John we are told that every book in the world could not contain everything Jesus said. Adam from Parable of the Vineyard has been studying and testing these and he his very excited about them. I think it's worth jumping in and taking a look. There are some historical accounts that are inaccurate, but there is a lot to learn from these despite that. He does a great job of relating it to the New Testament and has a great understanding of Torah which is very helpful.
Hang in until Chapter 3 where it gets good. He included a download of ithese books on PDF form, just check the description.
Get all the details in this great video from Parable of the Vineyard.