We are to reckon the sinful nature dead to our threefold enemy (the world, the flesh, and the devil) as it hangs with Christ on the cross of Calvary. However, to effectively do this, we need the assistance of the Ten Commandments to kill our sinful nature (see Rom. 7:10,11). The Law sends us to the cross and keeps us there. “You shall not commit adultery” keeps our heart from lust. “You shall not covet” keeps our eyes off this attractive world, etc. See Rom. 13:8–10 for what the Commandments do for the godly.
2 Samuel 18:14 Then Joab said, “I cannot linger with you.” And he took three spears in his hand and thrust them through Absalom’s heart, while he was still alive in the midst of the terebinth tree.15 And ten young men who bore Joab’s armor surrounded Absalom, and struck and killed him.16 So Joab blew the trumpet, and the people returned from pursuing Israel. For Joab held back the people.