God commanded us to celebrate His acts of redemption through Sabbath observance because Sabbath pointed forward to the culmination of Redemption in a new creation. Sabbath observance is an anticipation of heaven in this imperfect world.
In Deuteronomy Israel is commanded to keep the Sabbath in view of God’s finished work of deliverance from Egyptian bondage. The Exodus from Egypt pointed forward to the ultimate work of deliverance from sin that Christ would accomplish on the cross when He said, “It is finished!” (John 19:30).
The sad story is that those who were delivered from Egypt were unable to enter into the rest that God had promised them. When the Israelites arrived at Kadesh Barnea, at the border of the Promised Land, they lacked the faith that they needed.
Hebrews 3 and 4 introduce Jesus as the One who will provide rest for us. This progression makes sense once we remember that the Davidic covenant promised that God would give the promised king and his people “rest” from their enemies (2 Sam. 7:10, 11). This rest is available to us now that Jesus is seated at the right hand of God.
Hebrews 2:13 contains the words of Jesus to His Father talking about His brethren: “‘Here am I and the children whom God has given Me’” (Heb. 2:13, NKJV). Patrick Gray suggests that Jesus is described here as the Guardian of His brothers.
Jesus did not have to overcome any kind of moral or ethical imperfection. He was perfect both morally and ethically. Hebrews does say, however, that Jesus underwent a process of “perfecting” that provided Him with the means to save us. Jesus was perfected in the sense that He was equipped to be our Savior.