1 Chronicles 12:37

Of the Reubenites and Gadites and the half-tribe of Manasseh from beyond the Jordan, 120,000 men armed with all the weapons of war.

Numbers 32:33-42

And Moses gave to them, to the people of Gad and to the people of Reuben and to the half-tribe of Manasseh the son of Joseph, the kingdom of Sihon king of the Amorites and the kingdom of Og king of Bashan, the land and its cities with their territories, the cities of the land throughout the country.

Deuteronomy 3:12-16

"When we took possession of this land at that time, I gave to the Reubenites and the Gadites the territory beginning at Aroer, which is on the edge of the Valley of the Arnon, and half the hill country of Gilead with its cities.

Joshua 13:7-32

Now therefore divide this land for an inheritance to the nine tribes and half the tribe of Manasseh."

Joshua 14:3

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

Joshua 22:1-10

At that time Joshua summoned the Reubenites and 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 because he defiled his father's couch, his birthright was given to the sons of Joseph the son of Israel, so that he could not be enrolled as the oldest son;

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 because he defiled his father's couch, his birthright was given to the sons of Joseph the son of Israel, so that he could not be enrolled as the oldest son;
Numbers 32:33
And Moses gave to them, to the people of Gad and to the people of Reuben and to the half-tribe of Manasseh the son of Joseph, the kingdom of Sihon king of the Amorites and the kingdom of Og king of Bashan, the land and its cities with their territories, the cities of the land throughout the country.
Deuteronomy 3:12
"When we took possession of this land at that time, I gave to the Reubenites and the Gadites the territory beginning at Aroer, which is on the edge of the Valley of the Arnon, and half the hill country of Gilead with its cities.
Joshua 13:7
Now therefore divide this land for an inheritance to the nine tribes and half the tribe of Manasseh."
Joshua 14:3
For Moses had given an inheritance to the two and one-half tribes beyond the Jordan, but to the Levites he gave no inheritance among them.
Joshua 22:1
At that time Joshua summoned the Reubenites and the Gadites and the half-tribe of Manasseh,

The Holy Bible, English Standard Version® copyright © 2001 by Crossway Bibles, a publishing ministry of Good News Publishers.