Deuteronomy 3:16

16 And to Ruben and to Gad I gave under Galaad as far as the brook of Arnon, the border between the brook and as far as Jaboc; the brook the border to the children Amman.

Deuteronomy 3:16 Meaning and Commentary

Deuteronomy 3:16

And unto the Reubenites, and unto the Gadites
The tribes of Reuben and Gad:

I gave from Gilead even unto the river Arnon:
see ( Deuteronomy 3:12 )

half the valley and the border;
or rather half the river, the river Arnon; and so it is rendered "the middle of the river", in ( Joshua 12:2 ) and so here the middle of the torrent by the Vulgate Latin and Septuagint versions, and by Onkelos:

even unto the river Jabbok, which is the border of the children of
Ammon;
beyond which the land given to the tribes of Reuben and Gad reached not; see ( Deuteronomy 2:37 ) .

Deuteronomy 3:16 In-Context

14 And Jair the son of Manasse took all the country round about Argob as far as the borders of Gargasi and Machathi: he called them by his name Basan Thavoth Jair until this day.
15 And to Machir I gave Galaad.
16 And to Ruben and to Gad I gave under Galaad as far as the brook of Arnon, the border between the brook and as far as Jaboc; the brook the border to the children Amman.
17 And Araba and Jordan the boundary of Machanareth, even to the sea of Araba, the salt sea under Asedoth Phasga eastward.
18 And I charged you at that time, saying, The Lord your God has given you this land by lot; arm yourselves, every one powerful, and go before your brethren the children of Israel.

The Brenton translation of the Septuagint is in the public domain.