And unto the Reubenites and unto the Gadites I gave from Gilead even unto the river Arnon half the valley, and the border even unto the river {f} Jabbok, which is the border of the children of Ammon;

(f) Which separates the Ammonites from the Amorites.

Wesley's Notes

3:16 Half the valley - Or rather to the middle of the river: for the word rendered half signifies commonly middle, and the same Hebrew word means both a valley and a brook or river. And this sense is agreeable to the truth, that their land extended from Gilead unto Arnon, and, to speak exactly, to the middle of that river; for as that river was the border between them and others, so one half of it belonged to them, as the other half did to others, Jos 12:2. The same thing is expressed in the same words in the Hebrew which are here, though our translators render the self - same words there, from the middle of the river, which here they render, half of the valley. There the bounds of Sihon's kingdom, which was the same portion here mentioned as given to Reuben and Gad, are thus described, from Aroer, which is upon the bank of the river of Arnon, and from the middle of the river, and from half Gilead, even unto the river Jabbok, which is the border of the children of Ammon.

Jamieson-Fausset-Brown Bible Commentary

16. from Gilead-that is, not the mountainous region, but the town Ramoth-gilead,

even unto the river Arnon half the valley-The word "valley" signifies a wady, either filled with water or dry, as the Arnon is in summer, and thus the proper rendering of the passage will be-"even to the half or middle of the river Arnon" (compare Jos 12:2). This prudent arrangement of the boundaries was evidently made to prevent all disputes between the adjacent tribes about the exclusive right to the water.

Matthew Henry's Concise Commentary

3:12-20 This country was settled on the Reubenites, Gadites, and half the tribe of Manasseh: see Nu 32. Moses repeats the condition of the grant to which they agreed. When at rest, we should desire to see our brethren at rest too, and should be ready to do what we can towards it; for we are not born for ourselves, but are members one of another.

Matthew Henry's Whole Bible Commentary

Verses 12-20

Having shown how this country which they were now in was conquered, in these verses he shows how it was settled upon the Reubenites, Gadites, and half the tribe of Manasseh, which we had the story of before, Num. 32. Here is the rehearsal. 1. Moses specifies the particular parts of the country that were allotted to each tribe, especially the distribution of the lot to the half tribe of Manasseh, the subdividing of which tribe is observable. Joseph was divided into Ephraim and Manasseh; Manasseh was divided into one half on the one side Jordan and the other half on the other side: that on the east side Jordan was again divided into two great families, which had their several allotments: Jair, v. 14, Machir, v. 15. And perhaps Jacob's prediction of the smallness of that tribe was now accomplished in these divisions and subdivisions. Observe that Bashan is here called the land of the giants, because it had been in their possession, but Og was the last of them. These giants, it seems, had lost their country, and were rooted out of it sooner than any of their neighbours; for those who, presuming upon their strength and stature, had their hand against every man, had every man's hand against them, and went down slain to the pit, though they were the terror of the mighty in the land of the living. 2. He repeats the condition of the grant which they had already agreed to, v. 18-20. That they should send a strong detachment over Jordan to lead the van in the conquest of Canaan, who should not return to their families, at least not to settle (though for a time they might retire thither into winter quarters, at the end of a campaign), till they had seen their brethren in as full possession of their respective allotments as they themselves were now in of theirs. They must hereby be taught not to look at their own things only, but at the things of others, Phil. 2:4. It ill becomes an Israelite to be selfish, and to prefer any private interest before the public welfare. When we are rest we should desire to see our brethren at rest too, and should be ready to do what we can towards it; for we are not born for ourselves, but are members one of another. A good man cannot rejoice much in the comforts of his family unless withal he sees peace upon Israel, Ps. 128:6.