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.
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.
They were now to dwell at a distance from the sanctuary of the Lord, and it was with an anxious heart that Joshua witnessed their departure, knowing how strong would be the temptations, in their isolated and wandering life, to fall into the customs of the heathen tribes that dwelt upon their borders. PP 518.1
While the minds of Joshua and other leaders were still oppressed with anxious forebodings, strange tidings reached them. Beside the Jordan, near the place of Israel's miraculous passage of the river, the two and a half tribes had erected a great altar, similar to the altar of burnt offering at Shiloh. The law of God prohibited, on pain of death, the establishment of another worship than that at the sanctuary. If such was the object of this altar, it would, if permitted to remain, lead the people away from the true faith. PP 518.2
The representatives of the people assembled at Shiloh, and in the heat of their excitement and indignation proposed to make war at once upon the offenders. Through the influence of the more cautious, however, it was decided to send first a delegation to obtain from the two and a half tribes an explanation of their conduct. Ten princes, one from each tribe, were chosen. At their head was Phinehas, who had distinguished himself by his zeal in the matter of Peor. PP 518.3
The two and a half tribes had been at fault in entering, without explanation, upon an act open to such grave suspicions. The ambassadors, taking it for granted that their brethren were guilty, met them with sharp rebuke. They accused them of rebelling against the Lord, and bade them remember how judgments had been visited upon Israel for joining themselves to Baalpeor. In behalf of all Israel, Phinehas stated to the children of Gad and Reuben that if they were unwilling to abide in that land without an altar for sacrifice, they would be welcome to a share in the possessions and privileges of their brethren on the other side. PP 518.4
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