1 Chronicles 5:9

Overview - 1 Chronicles 5
Judah and Joseph preferred before Reuben, who forfeited his birthright.
Ruben's descendants; some of whom vanquish the Hagarites.
11 The chief men of Gad, and their habitations.
18 Ruben, Gad, and half of Manasseh, obtain a victory over the Hagarites.
23 The habitations and chief men of that half of Manasseh.
25 The captivity of the two tribes and half, for their sins.
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1 Chronicles 5:9  (King James Version)
And eastward he inhabited unto the entering in of the wilderness from the river Euphrates: because their cattle were multiplied in the land of Gilead.

unto the entering
That is, unto the borders of Arabia Deserta, which extends to the Euphrates.

Joshua 22:8 Joshua 22:9