1 Chronicles 12:37

And from beyond the Jordan, of the Reubenite, and of the Gadite, and of the half of the tribe of Manasseh, with all instruments of the host for battle, are a hundred and twenty thousand.

Numbers 32:33-42

And Moses giveth to them, to the sons of Gad, and to the sons of Reuben, and to the half of the tribe of Manasseh son of Joseph, the kingdom of Sihon king of the Amorite, and the kingdom of Og king of Bashan, the land by its cities, in the borders, the cities of the land round about.

Deuteronomy 3:12-16

And this land we have possessed, at that time; from Aroer, which is by the brook Arnon, and the half of mount Gilead, and its cities, I have given to the Reubenite, and to the Gadite;

Joshua 13:7-32

And now, apportion this land for an inheritance to the nine tribes, and the half of the tribe of Manasseh,' --

Joshua 14:3

for Moses hath given the inheritance of two of the tribes, and of half of the tribe, beyond the Jordan, and to the Levites he hath not given an inheritance in their midst;

Joshua 22:1-10

Then Joshua calleth for the Reubenite, and for the Gadite, and for the half of the tribe of Manasseh,

1 Chronicles 5:1-10

As to sons of Reuben, first-born of Israel -- for he is the first-born, and on account of his profaning the couch of his father hath his birthright been given to the sons of Joseph son of Israel, and he is not to be reckoned by genealogy for the birthright,

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
As to sons of Reuben, first-born of Israel -- for he is the first-born, and on account of his profaning the couch of his father hath his birthright been given to the sons of Joseph son of Israel, and he is not to be reckoned by genealogy for the birthright,
Numbers 32:33
And Moses giveth to them, to the sons of Gad, and to the sons of Reuben, and to the half of the tribe of Manasseh son of Joseph, the kingdom of Sihon king of the Amorite, and the kingdom of Og king of Bashan, the land by its cities, in the borders, the cities of the land round about.
Deuteronomy 3:12
And this land we have possessed, at that time; from Aroer, which is by the brook Arnon, and the half of mount Gilead, and its cities, I have given to the Reubenite, and to the Gadite;
Joshua 13:7
And now, apportion this land for an inheritance to the nine tribes, and the half of the tribe of Manasseh,' --
Joshua 14:3
for Moses hath given the inheritance of two of the tribes, and of half of the tribe, beyond the Jordan, and to the Levites he hath not given an inheritance in their midst;
Joshua 22:1
Then Joshua calleth for the Reubenite, and for the Gadite, and for the half of the tribe of Manasseh,