Then shall the children of Judah and the children of Israel be gathered together, and appoint themselves one head, and they shall come up out of the land: for great shall be the day of Jezreel.
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Cyril of Alexandria
“They come up out of the land,” namely, they will live the life of the saints as well, “for great is the day of Jezreel.” Indeed, great is the day of Christ, when he will raise to life all the dead. In fact, he will descend from heaven and sit on his glorious throne. “And he will give everyone according to his works.” Therefore if one wishes to understand by “day” the time of the visitation—when the remission of sins is given by Christ to the Greeks, the Judaeans and those who have sinned against him—this will not deviate from the true words. For David too indicated the time of the coming of our Savior by saying, “This is the day that the Lord has made; let us be glad and rejoice in it.”
Head; Christ, (Challoner) the head of all the faithful, (Worthington) consisting both of Jews and Gentiles. Israel and Juda returned under Zorobabel (Calmet)
The prophets blend present and future transactions together. (St. Jerome in chap. iii.)
Jezrahel. That is, of the seed of God; for Jezrahel signifies the seed of God. (Challoner)
For may also be rendered, "when or though. "The seed of Jehu shall be exterminated. The kingdom, signified by Jezrahel, a great city, shall fall. (Calmet)