Numbers 20:18-22

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.

And the children of Israel, even the whole congregation, journeyed from Kadesh, and came unto mount Hor.