“Because you harbored an ancient hostility and delivered the Israelites over to the sword at the time of their calamity.” (Ezekiel 35:5)
The word of the LORD comes against Mount Seir: I am against you; I will stretch out my hand against you and make you a desolate waste. I will devastate your towns and you will be desolate. Then you will know that I am the LORD. Because you harbored an ancient hostility and delivered the Israelites over to the sword at the time of their calamity, the time their punishment reached its climax, therefore as surely as I live, declares the Sovereign LORD, I will give you over to bloodshed and it will pursue you. Since you did not hate bloodshed, bloodshed will pursue you. I will make Mount Seir a desolate waste and cut off from it all who come and go.
The Catechism identifies the ancient hostility of Edom toward Israel as the figure of the persistent enmity that exploits the moment of another's weakness rather than offering help (CCC 1933).
Brothers and sisters, they harbored an ancient hostility and waited for the moment of calamity to act on it. The resentment nursed over generations becomes the betrayal at the moment of maximum vulnerability. Examine your ancient hostilities. The resentments you harbor are waiting for their moment. Release them before they act.
Lord God, deliver us from harboring ancient hostilities that wait for the moment of the other's weakness. Through Christ our Lord. Amen.