Deuteronomy 20:19

When they besieged a town a long time to conquer it, they were not to destroy its trees, to swing the axe upon them. That we are to understand by עצהּ the fruit-trees in the environs and gardens of the town, is evident from the motive appended: "for of them (ממּנּוּ refers to עץ as a collective) thou eatest, and thou shalt not hew them down." The meaning is: thou mayest suppress and destroy the men, but not the trees which supply thee with food. "For is the tree of the field a man, that it should come into siege before thee?" This is evidently the only suitable interpretation of the difficult words השּׂדה עץ האדם כּי, and the one which has been expressed by all the older commentators, though in different ways. But it is one which can only be sustained grammatically by adopting the view propounded by Clericus and others: viz., by pointing the noun האדם with ה interrog., instead of האדם, and taking אדם as the object, which its position in the sentence fully warrants (cf. Ewald, 324, b. and 306, b.). The Masoretic punctuation is founded upon the explanation given by Aben Ezra, "Man is a tree of the field, i.e., lives upon and is fed by the fruits of the trees," which Schultz expresses in this way, "Man is bound up with the tree of the field, i.e., has his life in, or from, the tree of the field," - an explanation, however, which cannot be defended by appealing to Deu 24:6; Ecc 12:13; Eze 12:10, as these three passages are of a different kind. In no way whatever can האדם be taken as the subject of the sentence, as this would not give any rational meaning. And if it were rendered as the object, in such sense as this, The tree of the field is a thing or affair of man, it would hardly have the article. Deu 20:20 "Only the trees which thou knowest that they are not trees of eat…

This chapter settles the militia, and establishes the laws and ordinances of war, I. Relating to the soldiers. 1. Those must be encouraged that were drawn up to battle (Deu 20:1-4). 2. Those must be dismissed and sent back again whose private affairs called for their attendance at home (Deu 20:5-7), or whose weakness and timidity unfitted them for service in the field (Deu 20:8, Deu 20:9). II. Relating to the enemies they made war with. 1. The treaties they must make with the cities that were far off (Deu 20:10-15). 2. The destruction they must make of the people into whose land they were going (Deu 20:16-18). 3. The care they must take, in besieging cities, not to destroy the fruit-trees (Deu 20:19, Deu 20:20).

20:19 do not cut down the trees: Ordinarily, trees might be cut down during a war so the enemy could not benefit from them. However, since the Israelites were occupying the enemy’s former land, the trees could be of use to them.