Hebrews is an epistle, but it is different from all the others. This epistle stands apart from the others in the following ways:
We are not privy to the identity of the author.
We do not know who the intended audience is,
…Nor do we know where the letter was sent to or from.
The reason this letter is written, however, is to encourage a discouraged community of believers who are struggling with a couple of theological topics.
How to deal with suffering, and
Also, they have doubts about whether Jesus really took care of sin.
***The author writes to convince them to “not throw away your confidence.” (10:35)
Emphases of Hebrews
God has spoken his absolutely final word in his Son
to abandon Christ is to abandon God altogether
Christ is superior to everything that went before - the old revelation, its angelic mediators, the first exodus (Moses and Joshua) and the whole priestly system
God’s people can have full confidence in God’s Son, the perfect high priest, who gives all people ready access to God.