1 Chronicles 12:37-38
37 and from east of the Jordan, men of Reuben, Gad and the half-tribe of Manasseh, armed with every type of weapon—120,000.
38 All these were fighting men who volunteered to serve in the ranks. They came to Hebron fully determined to make David king over all Israel. All the rest of the Israelites were also of one mind to make David king.