וְהִכִּיתֶ֞ם כָּל־עִ֤יר מִבְצָר֙ וְכָל־עִ֣יר מִבְח֔וֹר וְכָל־עֵ֥ץ טוֹב֙ תַּפִּ֔ילוּ וְכָל־מַעְיְנֵי־מַ֖יִם תִּסְתֹּ֑מוּ וְכֹל֙ הַחֶלְקָ֣ה הַטּוֹבָ֔ה תַּכְאִ֖בוּ בָּאֲבָנִֽים׃
你們必攻破一切堅固的城和一切精選的城，砍倒一切佳美的樹木，堵塞一切水泉，又用石頭毀壞一切肥美的田地。»
Rashi
And every valuable tree you will chop down. Even though it is stated, “Do not harm any of its trees,”12Devarim 20:19. here He permitted it for you, for this is a contemptible and insignificant nation before Him. And so Scripture states, “You shall not pursue their peace and their benefit,”13Devarim 23:7. [i.e.,] these are the good trees that are among them.