4. The prophet here proceeds to show the cause of the destruction just foretold, namely, the rejection of Messiah.
      flock of . . . slaughter-- (Ps 44:22). God's people doomed to slaughter by the Romans. Zechariah here represents typically Messiah, and performs in vision the actions enjoined: hence the language is in part appropriate to him, but mainly to the Antitype, Messiah. A million and a half perished in the Jewish war, and one million one hundred thousand at the fall of Jerusalem. "Feed" implies that the Jews could not plead ignorance of God's will to execute their sin. Zechariah and the other prophets had by God's appointment "fed" them (Ac 20:28) with the word of God, teaching and warning them to escape from coming wrath by repentance: the type of Messiah, the chief Shepherd, who receives the commission of the Father, with whom He is one (Zec 11:4); and Himself says (Zec 11:7), "I will feed the flock of slaughter." Zechariah did not live to "feed" literally the "flock of slaughter"; Messiah alone "fed" those who, because of their rejection of Him, were condemned to slaughter. Jehovah-Messiah is the speaker. It is He who threatens to inflict the punishments (Zec 11:6, 8). The typical breaking of the staff, performed in vision by Zechariah (Zec 11:10), is fulfilled in His breaking the covenant with Judah. It is He who was sold for thirty pieces of silver (Zec 11:12, 13).

JFB.