1 Chronicles 15:4

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

David assembled the children of Aaron, and the Levites. The children of Aaron were the two priests (1 Chronicles 15:11), Zadok and Abiathar, heads of the two priestly houses of Eleazar and Ithamar, and colleagues in the high priesthood (2 Samuel 20:25). The Levites were the chiefs of their father's house (1 Chronicles 15:12), four belonging to the Kohathite branch, on whose shoulders the ark was to be borne-namely, Uriel, Shemaiah, descended from Elizaphan or Elizaphan (Exodus 6:22), Hebron (Exodus 6:18; 1 Chronicles 6:2), and Amminadab, from Uzziel (Exodus 6:22).