Powtórzonego Prawa 2:6 Komentarz: Rashi, Ramban, Ibn Ezra & Rabbeinu Bahya

תכרו — This is an expression denoting purchase. Similar is (Genesis 50:5; see Rashi thereon), “which I have bought (כריתי) for myself”, for thus in the coast cities do they use for "trading” the term כירה (Rosh Hashanah 26a).

YE SHALL PURCHASE FOOD OF THEM FOR MONEY. If you should desire to eat of the fruits of their land you should not take it from them except for the full price¹²⁹Ibid., 23:9. at their pleasure, this being the sense of the word me’itam (of them) [purchase food ‘of them,’ i.e., with their consent]. Also you shall not drink water of them at all, except for money with their consent.

you may buy food from them if they wish to sell. Some say, however, that it is a rhetorical question, as if to say, “you have not needed food nor drink all these years that you traveled”; this is borne out by the continuation God your God has blessed you.