“See, I have taken away your sin, and I will put fine garments on you.” (Zechariah 3:4)
Zechariah sees Joshua the high priest standing before the angel of the LORD, and Satan standing at his right side to accuse him. Joshua is dressed in filthy clothes. The LORD says to Satan: the LORD rebuke you, Satan! The LORD, who has chosen Jerusalem, rebuke you! Is not this man a burning stick snatched from the fire? Then the angel says: take off his filthy clothes. See, I have taken away your sin, and I will put fine garments on you. A clean turban is put on his head. If you walk in obedience to me and keep my requirements, then you will govern my house and have charge of my courts, and I will give you a place among these standing here. Listen, High Priest Joshua, you and your associates are men symbolic of things to come: I am going to bring my servant, the Branch.
The Catechism identifies the removal of filthy garments and the clothing in fine garments as the figure of Baptism: the forgiveness of sin and the clothing in Christ's righteousness (CCC 1243).
Brothers and sisters, Satan stands at Joshua's right hand to accuse. The accusation is true: the garments are filthy. But the LORD rebukes the accuser and removes the garments. This is the structure of every absolution: the accusation is valid, the garments are genuinely filthy, and God removes them anyway. The rebuttal to every accusation against you is not your innocence but the LORD's rebuke of the accuser.
Lord God, rebuke every accusation against your people. Take away our sin and put fine garments on us. Through Christ our Lord. Amen.