211 And it came to the ears of the Canaanite, the king of Arad, living in the South, that Israel was coming by the way of Atharim, and he came out against them and took some of them prisoners. 2 Then Israel made an oath to the Lord, and said, If you will give up this people into my hands, then I will send complete destruction on all their towns. 3 And the Lord, in answer to the voice of Israel, gave the Canaanites up to them; and they put them and their towns completely to destruction: and that place was named Hormah.
Matthew Henry's Commentary on Numbers 21:1-3
Commentary on Numbers 21:1-3
(Read Numbers 21:1-3)
Before the people began their march round the country of Edom, the king of Arad, a Canaanite, who inhabited the southern part of the country, attacked them in the wilderness, and took some prisoners. This was to lead the Israelites to look more thoroughly to the Lord.