1 Chronicles 12:37-38

37From the east side of the Jordan River, there were 120,000 soldiers who knew how to use many different kinds of weapons. Those men belonged to the tribes of Reuben, Gad and the other half tribe of Manasseh.

38All those men were soldiers who were ready to fight in war. They came to David in Hebron because they wanted to make him king to rule all Israel. All the other Israelites also agreed that David should become king.