Rashi on Numbers 20:17/רש"י על במדבר כ׳:י״ז

1נעברה נא בארצך LET US PASS, I PRAY THEE, THROUGH THY COUNTRY — You have no right to lay claim to the land of Israel as an inheritance, just the same as you have not paid the debt (see Rashi v. 14); render us therefore a little assistance by permitting us to pass through your land.

2ולא נשתה מי באר NEITHER WILL WE DRINK OF THE WATER OF THE SPRINGS — He should have said “water of the cisterns (בורות)”; but this was what Moses meant to say: Although we have manna to eat, and a well of which to drink, (that which followed them through the wilderness), we will not drink of it, but we will buy food and water from you to your advantage. From here we may learn a rule for a guest (one lodging in an inn): although he has in his possession something to eat, he should yet purchase something from the local tradesman in order to benefit his host (Midrash Tanchuma, Chukat 12).

3דרך המלך נלך וגו׳ WE WILL KEEP TO THE KING’S HIGHWAY etc. — we will muzzle our cattle, and so they will not turn aside into the fields on this side or that to eat (Midrash Tanchuma, Chukat 12).