Calvin's Commentaries, Vol. 6: Harmony of the Law, Part IV, tr. by John King, [1847-50], at sacred-texts.com
1. And when king Arad the Canaanite, which dwelt in the south, heard tell that Israel came by the way of the spies, then he fought against Israel, and took some of them prisoners.
1. Quum audisset Chananaeus rex Arad habitans in meridie quod veniret Israel per viam exploratorum, pugnavit cum Israele, et abduxit ab eo praedam (vel, captivitatem.)
2. 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.
2. Vovit ergo Israel votum Jehovae, et dixit, Si tradendo tradideris populum istum in manum meam, delebo urbes eorum.
3. And the Lord hearkened to the voice of Israel, and delivered up the Canaanites; and they utterly destroyed them and their cities: and he called the name of the place Hormah.
3. Et exaudivit Jehova vocem Israelis, et dedit Chananaeum, et delevit eos ac urbes eorum: vocavitque nomen loci illius Horma.
1. And when king Arad the Canaanite. It is not altogether agreed among commentators who this king Arad was. Some think that he was an Amalekite, but this error is refuted by the fact that the Amalekites had already attempted in vain to interrupt the journey of the people. Nor is it credible that after so great a slaughter, they would have endeavored to do so again, especially since their territories remained untouched. Besides, it would have been absurd to call the Amalekites Canaanites, since they derived their origin not from Canaan but from Esau, and thus were connected with the Israelites by a common descent from Shem. We shall, however, rightly understand this as referring to the Amorites, who were certainly reckoned among the Canaanites, as being of the same race; as Moses tells us in his first book, (Ge 10:16, and Ge 15:21;) nay, he elsewhere designates all the people of Canaan by the name of Amorites. Moreover, in the thirty-fourth chapter of this book, we shall see that their boundaries reached to mount Hor and Kadesh-barnea. Since, then, the Amorites were in this neighborhood towards the south, the name will suit them very well. That king Arad, however, alone made war upon them, arose from the paternal providence of God, who wished to accustom His people to the conquest of their enemies by degrees. If all these nations had united their forces, and made a combined attack upon an unwarlike people, it would have succumbed in astonishment and fear. But it was easier for them to defend themselves against a single nation. And yet, in the first combat, God permitted the Israelites to be routed, so that the victorious Canaanite took some booty, or led away some captives. And this also was useful to the Israelites, in order that, mistrusting their own strength, they might humbly betake themselves to the succor of God; for it behooved them to learn that, unless they were aided from on high, they would be altogether insufficient, when they had to resist many powerful nations, since they had not been able to withstand even a single people.
With respect to “the way of the spies,” some understand that, as the people had been taught by Joshua and Caleb, they followed the footsteps of those who had been sent to explore the land; but, inasmuch as it appears that the course was a different one, I know not whether this opinion is very tenable. Thus, some take the word דרך, derek, to mean “after the manner of,” 116 which appears to be harsh and constrained. Thus, then, I explain it, Since they had to advance through unknown regions, spies were sent on, according to custom, to direct the whole march; and hence king Arad knew that his territory was to be invaded, before the army had proceeded so far.
2. And Israel vowed a vow unto the Lord. This was a manifestation of piety, when they had sustained a loss, not to cast away hope, nor to murmur against God; but to encourage themselves by entreating His aid. To this slate of submissiveness they had been subdued by the chastisements of God, although the continuance of their obedience, as we shall presently see, was not of long duration. Any one at first sight would say that there was something absurd in this vow; but we gather from the result, that it was lawful and approved by God; for the sign of His approbation was that tie hearkened to the vows and cry of the people. I admit, indeed, that God sometimes answers defective prayers, but there is no doubt whatever but that Moses here commends their piety in the vow. We must consider, then, how it was lawful for them to offer the destruction of cities and the wasting of lands to God as a sacrifice of sweet savor; and the reply to this question will be easy, if we bear in mind that the vow did not originate in inconsiderate zeal, but rather in the command of God. It seems cruel to destroy an entire nation; but God had not only decreed its destruction, but had appointed the Israelites to execute His sentence. Hence the vow, of which we are now treating, was not idly spoken, being founded on God’s word, which is the first rule for vowing rightly. It was, indeed, allowable for them to spare the cities, in order to possess them themselves; but it was also allowable to devote them as an offering (in anathema) of first-fruits to God, as we are elsewhere told of the city of Jericho. This at any rate we must conclude, that although God had not openly and expressly commanded the cities to be utterly destroyed, still this vow was dictated by the Holy Spirit, lest the people should yield to sloth, and set themselves down in a single corner, but that, having desolated and wasted this region, they might encourage themselves the more to further progress. The vero חרם charam, which Moses employs, signifies, indeed, to destroy, and from it is derived the word, חרמה chormah, or Hormah, which implies a species of anathema, as if they devoted the land to the curse of God. Moses, however, adds, that the people performed the vow, under the obligation of which they had laid themselves; and praiseworthy indeed was their magnanimity, in refusing to avail themselves of a comfortable home by destroying the cities, which they had acquired by the right of war.
We know not whether the cities were destroyed immediately after the victory over their enemies; indeed, I rather conjecture that there was some interval of time, because the people did not straightway enter the boundaries of the promised land. And this more clearly appears from chapter 33, where, after this battle was fought, certain stations are enumerated, which are in another direction. It is probable, therefore, that they fought outside the boundaries of the Canaanites, and that, when the people came here soon afterwards, the land was finally put to the sword.
It is again S.M. who has mentioned this opinion. — W.