Theodoret of Cyrus
What can we understand from this passage: ‘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 guidance, the Israelites achieved triumphs not through military prowess but through divine assistance. God states, ‘I will send hornets before thee, and they shall destroy the Canaanites and the Hittites and the rest’ (Exodus 23:28). Additionally, He vanquished enemies with lightning from the heavens and hailstones of immense size. Consequently, the author notes that while under Joshua’s leadership, God did not entirely eradicate all the inhabitants of that region.
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This decision was so that subsequent generations could witness God's providence firsthand and, when confronted with adversaries, would call on the Lord for support. Instead of interpreting it as a temptation, Symmachus suggests that it was meant to provide training and teach the art of warfare. The expression employed by the Seventy, Let him tempt, should not imply God's ignorance. Indeed, even Abraham was not tested by God to understand his character, for it is also stated that God knew, ‘Abraham commanded his son and his house to keep all the judgments of the Lord God’ (Gen. 18:19). Thus, the purpose of divine testing is not for God to gain knowledge of humanity but to educate those lacking understanding. Just as God commanded Adam to engage his mind, He left certain nations to reveal the righteousness of some and to admonish the sinful nature of others. The writer articulates: ‘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 themselves reveal that the Hebrews were responsible for the incomplete liberation from the wickedness of those nations. Joshua defeated twenty-nine kings, excluding the commanders of Jericho and Gaius, with the Israelite army, despite lacking a city, strongholds, or seasoned warriors. Conversely, those who came after Joshua, with fortified cities, substantial wealth acquired from warfare, and a full array of weapons, including walls and trenches, were unable to vanquish the remaining nations due to their own iniquity.