Numbers 20:19
“And the children of Israel said unto him, We will go by the high way: and if I and my cattle drink of thy water, then I will pay for it: I will only, without doing any thing else, go through on my feet.”
Let us pass, I pray thee, through thy country: we will not pass through the fields, or through the vineyards, neither will we drink of the water of the wells: we will go by the king’s high way, we will not turn to the right hand nor to the left, until we have passed thy borders.
And Edom said unto him, Thou shalt not pass by me, lest I come out against thee with the sword.
And the children of Israel said unto him, We will go by the high way: and if I and my cattle drink of thy water, then I will pay for it: I will only, without doing any thing else, go through on my feet.
And he said, Thou shalt not go through. And Edom came out against him with much people, and with a strong hand.
Thus Edom refused to give Israel passage through his border: wherefore Israel turned away from him.
Counter-Arguments
The strongest case that this verse does not belong in this theme.

Cross-References
“Thou shalt sell me meat for money, that I may eat; and give me water for money, that I may drink: only I will pass through on my feet;”
“And a mixed multitude went up also with them; and flocks, and herds, even very much cattle.”
“Ye shall buy meat of them for money, that ye may eat; and ye shall also buy water of them for money, that ye may drink.”
“Thou shalt sell me meat for money, that I may eat; and give me water for money, that I may drink: only I will pass through on my feet;”
“And the kine took the straight way to the way of Beth–shemesh, and went along the highway, lowing as they went, and turned not aside to the right hand or to the left; and the lords of the Philistines went after them unto the border of Beth–shemesh.”