Commentary for Deuteronomy 20:20
רַ֞ק עֵ֣ץ אֲשֶׁר־תֵּדַ֗ע כִּֽי־לֹא־עֵ֤ץ מַאֲכָל֙ ה֔וּא אֹת֥וֹ תַשְׁחִ֖ית וְכָרָ֑תָּ וּבָנִ֣יתָ מָצ֗וֹר עַל־הָעִיר֙ אֲשֶׁר־הִ֨וא עֹשָׂ֧ה עִמְּךָ֛ מִלְחָמָ֖ה עַ֥ד רִדְתָּֽהּ׃ (פ)
Only the trees of which thou knowest that they are not trees for food, them thou mayest destroy and cut down, that thou mayest build bulwarks against the city that maketh war with thee, until it fall.
Rashi on Deuteronomy
עד רדתה [AND THOU SHALT BUILD BULWARKS AGAINST THE CITY …] UNTIL רדתה — This (the word רדתה) means “subduing”, [and the meaning is, thou shalt besiege it until] it becomes submissive.
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Sforno on Deuteronomy
רק עץ אשר תדע כי לא עץ מאכל הוא, even if it belongs to a category of trees which normally bear fruit; if you know that it is defective or too old to still bear fruit, so that no sane human being would waste his time on tending it, pruning it, etc. אותו תשחית, such a tree you may destroy for your own purposes.
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Rashbam on Deuteronomy
'רק עץ אשר תדע וגו, a tree which never bore fruit, whether close to the city under siege or distant from it, you may cut down to help you construct the ramparts from which to launch missiles; but a fruit bearing tree that is far enough removed from the city not to afford shelter to your enemy you must not cut down.
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