Theodoret of Cyrus
What does the passage mean when it says, ‘These tongues... forsake Jesus, that he may tempt Israel with them, all them that know not the wars of Canaan; but for the sake of the generations of the children of Israel, that they may teach me the wars, even as those who were before them knew them not’? Under Joshua’s leadership, the Israelites achieved victories not through their own military prowess but with divine assistance. As stated in Scripture, ‘I will send hornets before thee, and they shall destroy the Canaanites and the Hittites and the rest’ (Exodus 23:28). God also vanquished their foes with bolts of lightning and hailstones.
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The author notes that during Joshua's time, God chose not to utterly annihilate all the inhabitants of the land so that future generations would witness and experience His provision. These descendants, when faced with adversaries, would learn to cry out to the Lord for aid. Symmachus interprets it as a desire to prepare them and instruct them in the art of warfare, rather than merely tempting them. The phrasing used by the Septuagint, ‘Let him tempt,’ does not imply ignorance on God’s part. Just as God did not test Abraham to discern his character—since it is clear that ‘Abraham commanded his son and his house to keep all the judgments of the Lord God’ (Gen. 18:19)—God tests not to gain insight into His creation but to instruct those lacking understanding. He commanded Adam for the purpose of mental discipline. Likewise, He allowed certain nations to remain, demonstrating the righteousness of some and exposing the wickedness of others. The text states, ‘that Israel may be tempted by them, that they may be led away, if they will obey the commandments... which I commanded their fathers by the hand of Moses.’ The actions of the Hebrews themselves reveal their partial failure to rid the land of the wicked. Joshua defeated twenty-nine kings, excluding the leaders of Jericho and Ai, with an army that had no fortified cities or veterans in battle. Yet those who came after Joshua, equipped with fortified cities and abundant treasures earned through warfare, as well as a full arsenal of weapons, were unable to conquer the remaining nations due to their own wrongdoing.