18 But the king of Edom said, "Stay out of my land, or I will meet you with an army!" 19 The Israelites answered, "We will stay on the main road. If our livestock drink your water, we will pay for it. Just let us pass through your country. That's all we ask." 20 But the king of Edom replied, "Stay out! You may not pass through our land." With that he mobilized his army and marched out against them with an imposing force. 21 Because Edom refused to allow Israel to pass through their country, Israel was forced to turn around.
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.