Albert Barnes Commentary Zechariah 9:7

"And I will take away his blood out of his mouth, and his abominations from between his teeth; and he also shall be a remnant for our God; and he shall be as a chieftain in Judah, and Ekron as a Jebusite." — Zechariah 9:7 (ASV)

And I will take away his blood out of his mouth - The “abominations” being idol-sacrifices, the “bloods” will also be the blood mingled with the wine of sacrifices, of which David says, Their drink-offerings of blood will I not offer (Psalms 16:4); and Ezekiel unites the offenses, Ye eat with the blood, and lift up your eyes toward your idols, and shed blood (Ezekiel 33:25).

But he that remains - Better, “And he too” shall remain over to our God.” Of the Philistines too, as of Israel, a remnant shall be saved. After this visitation, their idolatry would cease; God speaks of the Philistine nation as one man; He would wring his idol-sacrifices and idol-enjoyments from him; he should exist as a nation, but as God’s.

And he shall be as a governor in Judah - Literally, “a captain of a thousand.”

He would be merged in Judah as in a larger whole, just as each tribe was divided into its “thousands.” Yet, he would be intimately blended, in no inferior position, with the people of God, as each converted nation became an integral yet unseparated whole in the people of God.

And Ekron as a Jebusite - Ekron was apparently the least important of the few remaining Philistine cities (see at Joel 1:8, vol. 1).

Yet he shall be like those of the Canaanite nations who were not destroyed, nor fled. Instead, they dwelt with the children of Benjamin and Judah (Joshua 15:63; Judges 1:21) in the very capital and center of Israel’s worship. As a type of the future conversion and absorption of the pagan, Ekron would be incorporated into Judah.