As powerful as sin is, the blood of Christ is more powerful still. In Christ, the chains of our captivity have been broken, and the light of His grace has shone the way of freedom. But how has He freed us? Christ has secured our freedom because, in the shedding of His blood, He operated in the divinely ordained munus triplex, the threefold office of Prophet, Priest, and King. This is why He is called "the faithful witness" (as Prophet); "the firstborn of the dead" (as Priest); and "the ruler of kings on earth" (as King) in Revelation 1:5. In the threefold office of Christ, we are granted our freedom from sin.
As Prophet, Jesus pronounced an end to all our sin. In the Old Testament, the prophet was the mouthpiece of God to the people. In fact, the prophet often prefaced his words by saying, "Thus says the Lord." As God's mouthpiece, the prophet spoke the words of indictment against the people for their sin (Isa. 1:4) and called them to repentance (v. 18). The prophet pronounced the forgiveness and pardon of God (Isa. 40:1–2). Jesus, as the final and sufficient Prophet, has done all of these for us. He came not just proclaiming the Word of God; He is the Word of God (John 1:1). He came to the world because of sin (Matt. 1:21). He proclaimed our need to repent and believe on Him (Mark 1:15). And He proclaimed our pardon and forgiveness for sin (Col. 1:14).
In the threefold office of Christ, we are granted our freedom from sin
As Priest, Jesus offered Himself as the sacrifice for all our sin. In the Old Testament, the high priest was the mediator between the holy God and His sinful people. As mediator, the high priest entered the Holy Place and offered a sacrifice to God on behalf of the people once a year on the Day of Atonement (Lev. 16:34). He sprinkled the blood of the sacrifice on the mercy seat "because of the uncleanness of the people of Israel and because of their transgressions, all their sins" (Lev. 16:16). This he did year after year after year. Christ, as our Mediator and High Priest, not only offered the sacrifice (once and for all), but He is the sacrifice. Like the high priest of old, Christ entered the Holy Place, but unlike the high priest, He entered to offer Himself. He had to enter only one time, for He sprinkled His own blood on the mercy seat. As the writer of Hebrews reminds us:
But when Christ appeared as a high priest of the good things that have come, then through the greater and more perfect tent (not made with hands, that is, not of this creation) he entered once for all into the holy places, not by means of the blood of goats and calves but by means of his own blood, thus securing an eternal redemption. For if the blood of goats and bulls, and the sprinkling of defiled persons with the ashes of a heifer, sanctify for the purification of the flesh, how much more will the blood of Christ, who through the eternal Spirit offered himself without blemish to God, purify our conscience from dead works to serve the living God. (Heb. 9:11–14)
As King, Jesus rules in such a way as not to allow sin to reign over us any longer. In the Old Testament, the monarchy was established for the peace, prosperity, and welfare of the nation. The prototype king was David. No king was ever as beloved as he was. He was God's viceregent among the people. With David on the throne, the nation of Israel could say, "All is well." Few things comfort a nation more than having a ruler of righteousness and strength sitting on the throne of power. It was said of David that he "reigned over all Israel. And David administered justice and equity to all his people" (2 Sam. 8:15). However, we have a King greater than David. Christ came in the line of David as David's son and yet also as David's Lord (Matt. 22:42–45). He is "the ruler of kings on earth" (Rev. 1:5) and "King of kings and Lord of lords" (19:16), including David. He rules with perfect justice and equity. As our King, He has fought our battles and now rules in such a way that sin never can reign over us (Rom. 6:7–14).
An excerpt from Blood Work by Anthony Carter.