Chapter 4 of Hebrews speaks of entering into the Sabbath rest. I am fairly certain that this is not referring to the tradition Sabbath; i.e., 7th day of the week. Is this referring to the New Covenant (Jesus’ redemptive act on the Cross)? Or is there something else going on here?
Our Sabbath Rest is the fulfillment of the Old Covenant Sabbath. On the 7th Day of creation God rested, because all the work of creation had been completed. He didn’t begin again after a day of rest, He rested from His work of creation forever because the job was finished. (Genesis 2:2-3)
As Jesus was dying He said, “It is finished.” (John 19:30) He was speaking of His part of the work of our salvation, being sacrificed for our sins. He never again took up the work of dying for our sins because the job was finished.
On the day we asked the Lord to be our Savior and dwell in our hearts, we entered into our Sabbath Rest because our part of the work of our salvation was completed. Just as God never again took up the work of Creation, and Jesus never again took up the work of dying for our sins, we never again take up the work of our salvation. It is finished.
Therefore, our Sabbath rest begins on the day we receive the Lord as our Savior by accepting His death as payment for our sins and lasts for the rest of our life.