4. Mose 21:9

If a man be found slain in a field, and the cause of his death be unknown, the murder shall be expiated by the sacrifice of a heifer in an uncultivated valley, Deu 21:1-4. The rites to be used on the occasion, Deu 21:5-9. The ordinance concerning marriage with a captive, Deu 21:10-14. The law relative to the children of the hated and beloved wives: if the son of the hated wife should be the first-born he shall not be disinherited by the son of the beloved wife, but shall have a double portion of all his father's goods, Deu 21:15-18. The law concerning the stubborn and rebellious son, who, when convicted, is to be stoned to death, Deu 21:19-21. Of the person who is to be hanged, Deu 21:22. His body shall not be left on the tree all night; every one that is hanged on a tree is accursed of God, Deu 21:23.

ISRAEL ATTACKED BY THE CANAANITES. (Num. 21:1-35) King Arad the Canaanite--rather, "the Canaanite king of Arad"--an ancient town on the southernmost borders of Palestine, not far from Kadesh. A hill called Tell Arad marks the spot. heard tell that Israel came by the way of the spies--in the way or manner of spies, stealthily, or from spies sent by himself to ascertain the designs and motions of the Israelites. The Septuagint and others consider the Hebrew word "spies" a proper name, and render it: "Came by the way of Atharim towards Arad" [KENNICOTT]. he fought against Israel, and took some of them prisoners--This discomfiture was permitted to teach them to expect the conquest of Canaan not from their own wisdom and valor, but solely from the favor and help of God (Deu 9:4; Psa 44:3-4).

And Moses made a serpent of brass,.... Which was the most proper metal to make it of, that it might resemble the fiery serpents, whether of a golden or scarlet colour: and Diodorus Siculus (d) speaks of some of the colour of brass, whose bite was immediately followed with death, and by which, if anyone was struck, he was seized with terrible pains, and a bloody sweat flowed all over him; and this was chosen also, because being burnished and bright, could be seen at a great distance, and with this metal Moses might be furnished from Punon, the next station to this, where they now were, Zalmonah, as appears from Num 33:42 a place famous for brass mines, and which Jerom (e) says, in his time, was a little village, from whence brass metal was dug, by such that were condemned to the mines: and put it upon a pole; as he was directed: and it came to pass, that if a serpent had bitten any man, when he beheld the serpent of brass, he lived: which was very marvellous, and the more so, if what physicians say is true, as Kimchi relates (f), that if a man bitten by a serpent looks upon a piece of brass he dies immediately: the lifting up of this serpent on a pole for such a purpose was a figure of the lifting up of Christ, either upon the cross, or in the ministry of the word, that whosoever looks unto him by faith may have healing; see Gill on Joh 3:14,where this type or figure is largely explained: the station the Israelites were now at, when this image was made, is called Zalmonah, which signifies an image, shadow, or resemblance, as the brazen serpent was; from Mount Hor, where they were last, to this place, according to Bunting (g), were twenty eight miles: this serpent did not remain in the place where it was set, but was taken with them, and continued until the days of Hezeki…

The armies of Israel now begin to emerge out of the wilderness, and to come into a land inhabited, to enter upon action, and take possession of the frontiers of the land of promise. A glorious campaign this chapter gives us the history of, especially in the latter part of it. Here is, I. The defeat of Arad the Canaanite (Num 21:1-3). II. The chastisement of the people with fiery serpents for their murmurings, and the relief granted them upon their submission by a brazen serpent (Num 21:4-9). III. Several marches forward, and some occurrences by the way (Num 21:10-20). IV. The celebrated conquest of Sihon king of the Amorites (Num 21:21-32), and of Og king of Bashan (Num 21:33-35), and possession taken of their land.