"And knew her not till she had brought forth her firstborn son: and he called his name Jesus." (Matthew 1:25)
Salvation in Old Testament terms meant deliverance from captivity. The Israelites were under gruesome slavery and God promised them salvation (Yeshuah). In other words God’s only begotten Son Jesus is the salvation -Yeshua. There is a beauty in calling out His name Yeshua. We need salvation from three rulers that kept us captive. St. Paul identifies the first ruler as sin. We shouldn’t allow sin to reign our mortal body. Anything that comes in between the love of God is idolatry and allowing the idol to reign over us is sin. It might be a lust or a temptation we do not have the right to live how the world lives. St. Paul says, “To live is Christ and to die is gain”. When we choose to follow Jesus, we no longer live but Christ lives in us therefore let the world see Jesus in us. When we follow Jesus we reckon ourselves dead unto sin and alive unto God!
In the Old Testament times, everything revolved around the Mosaic Law with the knowledge of practices leading men to fall short of the glory of God. Therefore God sent His Son Jesus who condemned the sin in His flesh. So, now in the New Testament time everything revolves around the knowledge of the Son of God. The stripes on His back, the chastisement which He bore are a condemnation of sin from our lives. Therefore we are not entitled or liable to obey sin but spiritually claim the victory that the Lord Jesus accomplished in His body for us on the cross.
For further reading: Romans 6, Isaiah 52:7