And they drove not out the Canaanites that dwelt in Gezer: but the Canaanites dwell among the Ephraimites unto this day, and serve under forced labor.
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George Leo Haydock
Gazer. It is not certain when the Ephraimites rendered this city tributary, or when it threw off the yoke. The king of Egypt afterwards conquered it, and gave it with his daughter to Solomon, chap. x. 33. (Calmet) See Judges i. 29.
The negligence of Ephraim was contrary to God's order, Exodus xx. (Menochius)
The Alexandrian Septuagint here inserts after day, "till Pharao, king of Egypt, went up and took the city, and burnt it with fire, and the Chanaanites and Pherezites, and the inhabitants of Gazer, he slew; and Pharao gave it as a dowry to his daughter. "Grabe adds what seems deficient, "and they became tributary slaves. "(Haydock)
“And the Canaanites have lived in the midst of Ephraim to this very day.” But Ephraim is interpreted as “fruitful.” Therefore, although it is fruitful, it is not able to eject the Canaanite (who is of a different and cursed seed) from its territory until this day. But we can also say this concerning the church. Taken another way, there is no soul who is able to remain pure in this present life seeking peace alone without sinning until he sees Christ, the peace of God and the one who [dwells] throughout all those who bear fruit. For no one is clean from sordidness, from strange or alien thinking [on his own]. And so, just as the Jebusites and Canaanites are always found in Jerusalem, it is also necessary to suffer for the casting out of these, but only those who call upon God are able to do so. - "Commentary on Joshua 16.10"