1 Chronicles 24:31

Overview - 1 Chronicles 24
The division of the sons of Aaron by lot into four and twenty orders.
20 The Kohathites,
26 and the Merarites, divided by lot.
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1 Chronicles 24:31  (King James Version)
These likewise cast lots over against their brethren the sons of Aaron in the presence of David the king, and Zadok, and Ahimelech, and the chief of the fathers of the priests and Levites, even the principal fathers over against their younger brethren.

1 Chronicles 24:5 1 Chronicles 24:6 ; Numbers 26:56

even the principal
The whole company being ranged according to their families, with the proper number of divisions, the order of their courses was assigned them by lot, without respect to rank or seniority.
25:8 26:13