“I took the two staffs and broke them, revoking the covenant I had made with all the nations, and the covenant of brotherhood between Judah and Israel.” (Zechariah 11:10,14)
Zechariah is asked to pasture a flock marked for slaughter. He takes two staffs, one called Favour and one called Union. In one month he dismisses three shepherds. He says: I will not be your shepherd. Let the dying die. The flock detests me, and I detest them. He takes thirty pieces of silver - the price set on him by the people. The LORD tells him to throw it to the potter, and so he throws the thirty pieces of silver into the house of the LORD to the potter. I took my staff called Favour and broke it, revoking the covenant. Then I broke my second staff called Union, revoking the covenant of brotherhood between Judah and Israel. A foolish shepherd then arises who does not care for the flock.
Matthew identifies the thirty pieces of silver and the potter's field with Judas Iscariot's betrayal of Jesus, explicitly citing this passage (Matthew 27:9-10). The Catechism identifies the thirty pieces of silver as the price of the rejected shepherd (CCC 557).
Brothers and sisters, thirty pieces of silver: that was the price set on the shepherd. A slave's recompense. The people who weighed out this price did not know they were pricing the Son of God. When Judas returned the money and it went to the potter's field, the prophecy of Zechariah was fulfilled. Every detail of the rejection was known before it happened. Nothing about the cross was a surprise to God.
Lord God, you knew every detail of the rejection before it happened. Nothing in the cross was a surprise to your love. Through Christ our Lord. Amen.