the Tribe of Reuben: some of, at David's Coronation
Source: TTT
1 Chronicles 12:37, 38
And from east of the Jordan, from Reuben, Gad, and the half-tribe of Manasseh there: 120,000 armed with every kind of weapon of war. / All these men of war, arrayed for battle, came to Hebron fully determined to make David king over all Israel. And all the rest of the Israelites were of one mind to make David king.