18 But Edom said to him, "You shall not pass through, or we will come out with the sword against you." 19 The Israelites said to him, "We will stay on the highway; and if we drink of your water, we and our livestock, then we will pay for it. It is only a small matter; just let us pass through on foot." 20 But he said, "You shall not pass through." And Edom came out against them with a large force, heavily armed. 21 Thus Edom refused to give Israel passage through their territory; so Israel turned away from them.
Matthew Henry's Commentary on Numbers 20:18-21
Commentary on Numbers 20:14-21
(Read Numbers 20:14-21)
The nearest way to Canaan from the place where Israel encamped, was through the country of Edom. The ambassadors who were sent returned with a denial. The Edomites feared to receive damage by the Israelites. And had this numerous army been under any other discipline than that of the righteous God himself, there might have been cause for this jealousy. But Esau hated Jacob because of the blessing; and now the hatred revived, when the blessing was about to be inherited. We must not think it strange, if reasonable requests be denied by unreasonable men, and if those whom God favours be affronted by men.