Hebrews 3:1-6 (verse 1 - Consider Jesus)

    Therefore, holy brothers, you who share in a heavenly calling, consider Jesus, the apostle and high priest of our confession, who was faithful to him who appointed him, just as Moses also was faithful in all God's house. For Jesus has been counted worthy of more glory than Moses—as much more glory as the builder of a house has more honor than the house itself. (For every house is built by someone, but the builder of all things is God.) Now Moses was faithful in all God's house as a servant, to testify to the things that were to be spoken later, but Christ is faithful over God's house as a son. And we are his house if indeed we hold fast our confidence and our boasting in our hope.
   
(Hebrews 3:1-6 ESV)

[Verse 1] - Therefore, holy brothers, you who share in a heavenly calling, consider Jesus, the apostle and high priest of our confession
Jesus - His Nature
Since Jesus assumed the nature of man, and he would be our merciful and our high priest, his character ought to be attentively considered and we ought to endeavor to fully understand it.  We are holy brothers. We are of one family. And we have been set apart to God. Our position is not of this world. We don't serve at the pleasure and honor of the world. We are of a different nature, a heavenly nature.

Jesus - His Purpose
So, consider Jesus. Think of his rank. Think of his dignity (He is worthy of honor and respect). Think of his holiness (He is completely devoted to God). Think of his sufferings (He came to die so that we may live). Think of his death (He took upon sin and bore the ultimate consequence of sin). Think of his resurrection (He had victory over death; He is one of a kind; He achieved something unique and different from anyone else). Think of his ascension (He resides with the father; he prepares a future home for us and this preparation is ongoing). Think of his intercession (He never leaves us, but stays with us, giving care to us). What He did for Me cannot be equaled.

Jesus - The Apostle
Jesus, the apostle. This is the only place that applies "apostle" to the Lord Jesus. The author telling us that Jesus is the apostle must be significant. The apostle is one who is sent. He is THE one.

But, here, since this chapter refers to Moses and draws a comparison to Moses, one could then think about how Moses was also sent by God. Moses was the great apostle of God to the Jewish people. [The Hebrew word for "send" is the basis for the word "apostle".] Though he may have never been called an apostle, he was the one sent by God to His people. And so, here, Jesus filled the place of Moses. He filled the place of an apostle (Moses) and high priest (Aaron). These two callings of old are now blended in Jesus.

Jesus - The High Priest
Jesus, the high priest. This epistle shows us that Jesus is superior in all respects to the high priest of the Jews. The high priest office was central and distinguished the Jewish religion, so it is necessary to show that all that dignified and valued the office of the high priest was to be found in the Christian system. Jesus performs all the functions of the high priest. But for now, Jesus is simply named the high priest. His characteristics will follow later.

Jesus - Our confession
This is Him. He is who we profess. He is who we confess. When we embrace Christianity, we embrace Jesus the apostle and Jesus the High Priest.