The two tribes and a half erected this altar in order to keep alive their claim to have the same interest as the other tribes had in the sanctuary of God, which was established on the west side of Jordan: and in order to forestall any assertion that the Jordan itself was a natural barrier of exclusion between them and the sanctuary, they built it on the west or Canaanite bank of the Jordan and not on the east.

The word rendered "borders" is noteworthy; it means circuits, arrondissements.

The borders of Jordan, that are in - Canaan - This verse can never mean that they built the altar on the west side of Jordan, for this was not in their territories; nor could it be a place for the purpose of public worship to their own people, if built on the opposite side of Jordan; besides, the next verse says it was built over against the land of Canaan. It appears that when they came to the river they formed the purpose of building the altar; and when they had crossed it they executed their purpose.

A great altar to see to - A vast mass of earth, stones, etc., elevated to a great height, to serve as a memorial of the transactions that had already taken place. Probably it was intended also to serve as a kind of watchtower, being of a stupendous height, altare infinitae magnitudinis, an altar of an immense size, as the Vulgate terms it.

And when they came unto the borders of Jordan, that are in the land of Canaan,.... To the banks of it, or the sand heaps, some take the word to signify, which were thrown up to restrain the waters from overflowing; some by Geliloth understand a place so called; and Jerom (g) says it was near Jordan in the tribe of Benjamin: but rather the word signifies the meanders, windings, and turnings, of the river (h); and such circuits and compasses it fetched near Jericho, as the same writer (i) observes, where we may suppose these tribes went over, and at a place where the river jetted out into the land of Canaan:

the children of Reuben, and the children of Gad, built there an altar by Jordan; or "then"; that is, when they had passed over the river into their own country, for which Josephus is express (k); and certain it is, that the altar was built not on the Canaan side of Jordan, but on the opposite side, as is clear from Joshua 22:11, and indeed they had no right to build on any other ground than their own; and they pitched upon a spot where the river jetted out into the land of Canaan, as most proper to erect it on, to be a witness, that though separated from the rest of the Israelites by the river Jordan, yet were a part of them, and had a right to join them in the service of God, and bring their sacrifices to the altar of God in the tabernacle, as more fully appears in some after verses:

a great altar to see to; built up very high, so that it might be seen at a great distance.

(g) De loc. Heb. fol. 92. C. (h) Vid. Gusset. Ebr. Comment. p. 170, 573. Reland. Palestin. Illustrat. tom. 1. l. 1. c. 43. p. 274, 279. (i) Ut supra, (De loc. Heb. fol. 92.) G. (k) Antiqu. l. 5. c. 1. sect. 26.

And when they came unto the borders of Jordan, that are in the land of Canaan, the children of Reuben and the children of Gad and the half tribe of Manasseh built {f} there an altar by Jordan, a great altar to see to.

(f) That is, beyond Jordan: for sometime the whole country on both sides of Jordan is referred to as Canaan.

22:10 Built an altar - About that time when they came to them, they designed it, and as soon as they were got over Jordan, which was in a very little time, they effected and perfected it. They built it, no doubt, on their own side of the water: for how could they build on other men's land, without their consent? And it is said, in the following verse , to be over against the land of Jordan. Nor would there have been cause to suspect that it was designed for sacrifice, if they had not built it among themselves.

Jos 22:10. They Build the Altar of Testimony on Their Journey.

10. when they came unto the borders of Jordan, that are in the land of Canaan, the children of Reuben . built there an altar by Jordan-This altar was probably an immense pile of stones and earth. The generality of our translators supposes that it was reared on the banks of the Jordan, within the limits of Canaan proper. But a little closer examination seems to make the conclusion irresistible that its position was on the eastern side of the river, for these two reasons; first, because it is said (Jos 22:11) to have been built "over against," or in the sight of the land of Canaan-not within it; and secondly, because the declared motive of the trans-jordanic Israelites in erecting it was to prevent their brethren in Canaan ever saying, "in time to come, What have ye to do with the Lord God of Israel? For the Lord hath made Jordan a border between us and you," &c. [Jos 22:24, 25]. Such a taunt would be obviously prevented or confuted by the two tribes and a half having on the eastern side of Jordan, within their own land, a facsimile of the altar at Shiloh, as a witness that they acknowledged the same God and practised the same rites of worship as the brethren in Canaan.

22:10-20 Here is the care of the separated tribes to keep their hold of Canaan's religion. At first sight it seemed a design to set up an altar against the altar at Shiloh. God is jealous for his own institutions; we should be so too, and afraid of every thing that looks like, or leads to idolatry. Corruptions in religion are best dealt with at first. But their prudence in following up this zealous resolution is no less commendable. Many an unhappy strife would be prevented, or soon made up, by inquiries into the matter of the offence. The remembrance of great sins committed formerly, should engage us to stand on our guard against the beginnings of sin; for the way of sin is down-hill. We are all concerned to reprove our neighbour when he does amiss, lest we suffer sin upon him, Le 19:17. The offer made that they should be welcome to come to the land where the Lord's tabernacle was, and settle there, was in the spirit of true Israelites.