The book of Hebrews appeared during a critical time in the history of the early church. The destruction of Jerusalem was impending and many of the believers velieved the end of the world was near. However, Paul warned the church against entertaining a false hope, for he knew they were misguided with their beliefs. It was a critical time - the apostles were passing away, and soon the church would be left alone. It was in this hour of perplexity that the book of Hebrews appeared with needed light and comfort. The people needed a clear conception of the work Christ was doing for them in the courts above, and this book explained the delay in His return, and restored their wavering faith.
Hebrews clearly lays out the present priestly ministry of Christ in the life of the believer. Jesus is both the divine Son of God and completely human, and in His priestly role He clears the way for human beings to approach the Father in heaven through prayer Hebrews 4:14–16 - So then, since we have a great High Priest who has entered heaven, Jesus the Son of God, let us hold firmly to what we believe. This High Priest of ours understands our weaknesses, for he faced all of the same testings we do, yet he did not sin. So let us come boldly to the throne of our gracious God. There we will receive his mercy, and we will find grace to help us when we need it most.
The priesthood of Jesus is superior to the Old Testament priesthood of Aaron, because only through Jesus do we receive eternal salvation (5:1–9). Furthermore, Jesus became the permanent and perfect High Priest, going beyond all other priests by offering Himself as a sinless sacrifice on behalf of the sins of human beings (7:24–26; 9:28).