And Israel vowed a vow unto the Lord,.... The Israelites made supplication to the Lord for help against their enemies, and that he would give them victory over them, and made promises to him:

and said, if thou wilt indeed deliver this people into my hand; certainly and entirely deliver them, so as that a complete victory shall be obtained over them:

then will I utterly destroy their cities; or "anathematize", or devote them to utter destruction (o); slay man and beast, burn their houses and take their goods, not for a spoil, for their own private use, but reserve them for the service of God; all which is implied in the vow made, as was done to Jericho, Joshua 6:21 and so it is a vow, as Abendana observes, of what they would do when they came to the land of Canaan.

(o) "et anathematisabo", Montanus; "devovebo", Tigurine version.

The Israelites then vowed to the Lord, that if He would give this people into their hands, they would "ban" their cities; and the Lord hearkened to the request, and delivered up the Canaanites, so that they put them and their cities under the ban. (On the ban, see at Leviticus 27:28). "And they called the place Hormah," i.e., banning, ban-place. "The place" can only mean the spot where the Canaanites were defeated by the Israelites. If the town of Zephath, or the capital of Arad, had been specially intended, it would no doubt have been also mentioned, as in Judges 1:17. As it was not the intention of Moses to press into Canaan from the south, across the steep and difficult mountains, for the purpose of effecting its conquest, the Israelites could very well content themselves for the present with the defeat inflicted upon the Canaanites, and defer the complete execution of their vow until the time when they had gained a firm footing in Canaan. The banning of the Canaanites of Arad and its cities necessarily presupposed the immediate conquest of the whole territory, and the laying of all its cities in ashes. And so, again, the introduction of a king of Hormah, i.e., Zephath, among the kings defeated by Joshua (Joshua 12:14), is no proof that Zephath was conquered and called Hormah in the time of Moses. Zephath may be called Hormah proleptically both there and in Joshua 19:4, as being the southernmost border town of the kingdom of Arad, in consequence of the ban suspended by Moses over the territory of the king of Arad, and may not have received this name till after its conquest by the Judaeans and Simeonites. At the same time, it is quite conceivable that Zephath may have been captured in the time of Joshua, along with the other towns of the south, and called Hormah at that time, but that the Israelites could not hold it then; and therefore, after the departure of the Israelitish army, the old name was restored by the Canaanites, or rather only retained, until the city was retaken and permanently held by the Israelites after Joshua's death (Judges 1:16-17), and received the new name once for all. The allusion to Hormah here, and in Numbers 14:45, does not warrant the opinion in any case, that it was subsequently to the death of Moses and the conquest of Canaan under Joshua that the war with the Canaanites of Arad and their overthrow occurred.

And Israel vowed a vow unto the LORD, and said, If thou wilt indeed deliver this people into my hand, then I will utterly destroy their cities.

21:2 I will utterly destroy them - I will reserve no person or thing for my own use, but devote them all to total destruction.

2, 3. Israel vowed a vow unto the Lord-Made to feel their own weakness, they implored the aid of Heaven, and, in anticipation of it, devoted the cities of this king to future destruction. The nature and consequence of such anathemas are described (Le 27:1-34; De 13:1-18). This vow of extermination against Arad [Nu 21:2] gave name to the place Hormah (slaughter and destruction) though it was not accomplished till after the passage of the Jordan. Others think Hormah the name of a town mentioned (Jos 12:14).

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.