1 Chronicles 15:5 KJV

Of the sons of Kohath; Uriel the chief, and his brethren an hundred and twenty:
1 Chronicles 15:5, King James Version

In context

4 And David assembled the children of Aaron, and the Levites:

5 Of the sons of Kohath; Uriel the chief, and his brethren an hundred and twenty:

6 Of the sons of Merari; Asaiah the chief, and his brethren two hundred and twenty: