In the book of Judges, it is noted that Judah failed to conquer Gaza and Ascalon: they took the hill country, but were unable to drive out the inhabitants of the land because Rehobo was opposed to them, and there were iron chariots present. The book of Joshua states that God granted the entirety of the land to the Israelites as an inheritance: "And the Lord gave the whole land to Israel, which they swore to their fathers to give; and they inherited it, and dwelt in it" (Joshua 21:43). According to the insights of the venerable Augustine, it can be deduced from these passages that although the whole land was indeed destined for the Israelites, certain portions were not yet given into their possession; however, they were designated for the Hebrews for a significant purpose.
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In the book of Deuteronomy, God instructs the Israelites to gradually eliminate the foreign nations rather than do so quickly, lest the land become desolate and wild animals multiply, ultimately threatening the Israelites (Deuteronomy 7:22). Another reason provided for why God delayed the complete removal of the inhabitants is to keep the Israelites alert to their adversaries, ensuring they would not become complacent and would remain prepared to defend themselves. Furthermore, the influence of pagan idolatry had previously led the Israelites to destruction and temptation due to their transgressions (Judges 3:1-4). God's allowance of this circumstance was not intended as a means of comfort through trials and destruction; instead, it was a consequence of their future disobedience, which brought upon themselves punishment. This punishment was not predestined to compel them towards idolatry; rather, it was meant to serve as a caution to foster genuine reverence for God and to fortify their faith and devotion.