1 Chronicles 12:37

And from beyond the Jordan, from the Reubenites and the Gadites and the half-tribe of Manasseh, with all [their] weapons of war for battle: one hundred and twenty thousand.

Numbers 32:33-42

So Moses gave to them, to the descendants of Gad and the descendants of Reuben, and to half of the tribe of Joseph's son Manasseh, the kingdom of Sihon the king of Amorites and the kingdom of Og the king of the Bashan, the land with its cities [and their] territories, the cities of the surrounding land.

Deuteronomy 3:12-16

And [so] we took possession of this land at that time, from Aroer, which [is] on the [edge of the] wadi of Arnon, and [also] half of the hill country of Gilead and its towns I gave to the Reubenites and to the Gadites.

Joshua 13:7-32

Therefore, divide this land as an inheritance to the nine tribes and the half-tribe of Manasseh."

Joshua 14:3

For Moses had given [an] inheritance of [the] two tribes and the half-tribe beyond the Jordan, but to the Levites he gave no inheritance among them.

Joshua 22:1-10

Then Joshua summoned the Reubenites, the Gadites, and the half-tribe of Manasseh,

1 Chronicles 5:1-10

The sons of Reuben the firstborn of Israel (for he was the firstborn, but when he defiled the couch of his father, his birthright was given to the sons of Joseph, the son of Israel, so that he was not enrolled in the genealogy as the firstborn,

Treasury of Scripture Knowledge

Summary

And on the other side of Jordan, of the Reubenites, and the Gadites, and of the half tribe of Manasseh, with all manner of instruments of war for the battle, an hundred and twenty thousand.

Bible References

The other side

1 Chronicles 5:1
The sons of Reuben the firstborn of Israel (for he was the firstborn, but when he defiled the couch of his father, his birthright was given to the sons of Joseph, the son of Israel, so that he was not enrolled in the genealogy as the firstborn,
Numbers 32:33
So Moses gave to them, to the descendants of Gad and the descendants of Reuben, and to half of the tribe of Joseph's son Manasseh, the kingdom of Sihon the king of Amorites and the kingdom of Og the king of the Bashan, the land with its cities [and their] territories, the cities of the surrounding land.
Deuteronomy 3:12
And [so] we took possession of this land at that time, from Aroer, which [is] on the [edge of the] wadi of Arnon, and [also] half of the hill country of Gilead and its towns I gave to the Reubenites and to the Gadites.
Joshua 13:7
Therefore, divide this land as an inheritance to the nine tribes and the half-tribe of Manasseh."
Joshua 14:3
For Moses had given [an] inheritance of [the] two tribes and the half-tribe beyond the Jordan, but to the Levites he gave no inheritance among them.
Joshua 22:1
Then Joshua summoned the Reubenites, the Gadites, and the half-tribe of Manasseh,