Who was it written by and why or in other words Who, What, When, Where, Why.
SSN587,
The book was most likely commissioned by Paul after his struggle with James and the Jewish Christians still keeping the Law not only in Jerusalem but in all his territories. It seems reasonable that all NT books were either written or commissioned by an Apostle since they had real authority over others to make such decisions for the Faith. John would have commissioned the letter by James. Apostles that resided with James needed correction as well and Paul did that when he made several trips to them there. Thousands of Christian Jews were keeping the Law for some 20 to 40 years and James and the Apostles with him did nothing to stop them. You should be able to see this throughout the books of the NT. Then after Paul’s last visit to Jerusalem they nearly killed him. The Roman armies were called in to save his life. It is a story few tell and the WT would not like it revealed because of their claim of being modeled after this Jerusalem congregation with James seemingly in charge. Just so that you can see that all was not rosy in the Faith back then look at what they said to Paul during his fourth visit. Acts 21:24 Them take, and purify thyself with them, and be at charges with them, that they may shave their heads: and all may know that those things, whereof they were informed concerning thee, are nothing; but that thou thyself also walkest orderly, and keepest the law. 25 As touching the Gentiles which believe, we have written and concluded that they observe no such thing, save only that they keep themselves from things offered to idols, and from blood, and from strangled, and from fornication. Can you imagine doing that? Law keeping Hebrew Christians with apostles among them. Hebrews was written to put a stop to this practice once and for all. Paul even appointed elders to do that in his territories even before the book was written. Look how they applied their letter written in Acts chapter 15 some 14 years later. It is the same letter that the WT uses to enforce no blood laws. They restricted it to the Gentiles, forcing just a few Jewish laws and traditions on them instead of all the Law that they kept themselves and wanted Paul to keep. This is apostasy hiding in plain sight and few notice. That is the why as I understand it.
Joseph