Theodoret of Cyrus
What is the significance of 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 leadership, the Israelites achieved victories not through their own military prowess, but through divine assistance. God declared, ‘I will send hornets before thee, and they shall destroy the Canaanites and the Hittites and the rest’ (Exodus 23:28). He also vanquished foes by sending down lightning and hailstones.
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The author notes that during Joshua's leadership, God did not entirely wipe out all the inhabitants of the land so that future generations could experience His providence and, when faced with adversaries, would invoke the Lord's power to aid them. Rather than suggesting that Jesus should be tempted, Symmachus interprets this as an intention to prepare them and instruct them in warfare. However, the term used by the Septuagint, 'Let him tempt,' does not imply a lack of knowledge on God’s part. For even in the case of Abraham, God did not test him to discern his character, for it is recorded that God knew ‘Abraham commanded his son and his house to keep all the judgments of the Lord God’ (Gen. 18:19). Thus, God tests not to understand Himself, but to educate the uninformed. Just as He instructed Adam to engage his intellect, He allowed certain nations to remain in the land to reveal the righteousness of some and to correct the wickedness of others. This clarifies the writer’s point: ‘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.’ Evidence shows that it was indeed the Israelites' own shortcomings that led to an incomplete conquest over these wicked nations. Joshua defeated twenty-nine kings, excluding the leaders of Jericho and Ai, with the Israelite army, which lacked fortified cities, defenses, or experienced soldiers. Yet, those who came after Joshua, equipped with fortified strongholds and vast wealth gained from victories, and armed with various weapons and defensive measures, were unable to conquer the remaining nations due to their own corrupt actions.