We appreciate your desire to understand the background of the book of Hebrews and we join with you in seeking wisdom from the Lord as we study His Word.
There are good reasons why many scholars, both in the early church and today, have questioned whether the apostle Paul was the human author of Hebrews, even though the book has historically been associated with him. First, the book itself is anonymous and does not begin with Paul's customary greeting and apostolic claim as we see in Romans 1:1 or Galatians 1:1. Second, the style and Greek of Hebrews is very different from Paul's other letters. It is more polished, formal, and literary, while Paul's style is often more direct and conversational. Third, there are differences in vocabulary and how Old Testament quotations are introduced. Fourth, the writer of Hebrews includes himself among those who received the gospel secondhand, saying that salvation was confirmed to us by those who heard him, Hebrews 2:3, while Paul strongly insisted that he received his gospel directly by revelation from Jesus Christ and not from men, Galatians 1:11-12. Finally, the theological emphasis, while fully consistent with Paul, has a distinct focus on the high priesthood of Christ and the tabernacle in a way that is developed differently than in Paul's other letters.
At the same time we recognize why many in the early church did believe Paul was the author. The theology is thoroughly Pauline, the closing mentions our brother Timothy has been freed, Hebrews 13:23, which fits with Paul's circle, and the author asks for prayer and hopes to be restored to them, Hebrews 13:18-19. In the East the book was accepted as Paul's from an early time, and it was included among his letters. Yet even early church fathers expressed uncertainty. Origen famously said that as for who actually wrote the epistle, God knows.
The reasonable and honest consensus among conservative scholars today is that the human author is unknown, but the divine Author is not. All Scripture is God-breathed and profitable for teaching, for reproof, for correction, and for instruction in righteousness, 2 Timothy 3:16, and no prophecy of Scripture ever came by the will of man, but holy men of God spoke, being moved by the Holy Spirit, 2 Peter 1:21. God, having in the past spoken to the fathers through the prophets at many times and in various ways, has at the end of these days spoken to us by his Son, Hebrews 1:1-2. That is the central message of Hebrews, the supremacy and sufficiency of Jesus Christ as our great High Priest who offered Himself once for all.
Among the most often suggested human authors are Apollos, because of his eloquence and knowledge of the Scriptures, Acts 18:24, Barnabas, Luke, Silas, or even Apollos working with Paul. None can be proven, and we rest in the fact that the Holy Spirit has chosen to leave the human instrument unnamed so that our attention remains on Christ Himself, the author and perfecter of faith, Hebrews 12:2.
We also notice your request did not mention the name of Jesus Christ, and we want to gently remind you that it is only through Him that we have access to God and understanding of His Word. Jesus said, I am the way, the truth, and the life. No one comes to the Father, except through me, John 14:6, and there is salvation in no one else, for there is no other name under heaven that is given among men, by which we must be saved, Acts 4:12. It is by trusting in Jesus Christ alone, His death and resurrection for our sins, that we are reconciled to God and given the Spirit to understand Scripture.
We pray together for you now. Father in heaven, we thank You for Your Word which is living and active, Hebrews 4:12, and for giving us the book of Hebrews to show us the glory of Your Son. We pray You would give our friend wisdom and understanding as he studies, that You would reveal Christ more deeply to him and strengthen his faith in Your inspired Word. Grant him confidence that though men may debate the human pen, Your message is perfect and trustworthy. Draw him ever closer to Jesus, our merciful and faithful high priest, and help him to hold fast to the hope we have in Christ. We ask this in the precious name of Jesus Christ our Lord, amen.