"Anyone who is hung on a pole is under God's curse." (Deuteronomy 21:23)
Deuteronomy 21 covers a range of laws: the atonement for an unsolved murder, the treatment of female captives taken in war, the rights of the firstborn son of an unloved wife, and the rebellious son who is brought before the elders. Each law protects the dignity of persons in situations where abuse of power would be easiest: the victim of unsolved violence, the foreign woman, the child of an unloved mother, the disruptive member of the community. The covenant law insists on proper process and proper protection even in the most irregular circumstances.
The chapter closes with a law about criminals executed by hanging: their body must not remain on the pole overnight but must be buried the same day, because anyone hung on a pole is under God's curse. You must not desecrate the land the LORD your God is giving you as an inheritance. St. Paul quotes this verse in Galatians 3:13 as the key to understanding the Cross: Christ redeemed us from the curse of the law by becoming a curse for us, for it is written: cursed is everyone who is hung on a pole. Anyone who is hung on a pole is under God's curse. The Catechism identifies this verse as one of the most important texts for understanding the substitutionary atonement: Christ absorbed the curse of the law on our behalf so that the blessing of Abraham might come to the Gentiles (CCC 616).
Brothers and sisters, Christ became a curse for us. The one who hung on the pole of Calvary had done nothing to deserve the curse. He hung there to absorb the curse that the law pronounced over every sinner, so that no sinner who trusts him need carry it any longer. Let that exchange be real to you today.
Lord Jesus, you became a curse for us, hanging on the pole so that the blessing of Abraham might come to us. We receive the exchange: our curse for your blessing. Let us never pass under the curse that you have already borne for us. Through Christ our Lord. Amen.