31 They drew lots as their relatives, Aaron’s descendants, had done. They drew them in front of King David, Zadok, Ahimelech, and the leaders of the families of the priests and Levites. The families of the oldest brother were treated the same way as those of the youngest.
1 Chronicles 24:31 Cross References - NSB
Numbers 26:56
56 »Whether the tribes are large or small, the land must be divided by drawing lots.«
1 Chronicles 24:5-6
5 Both groups were divided impartially by drawing lots so that there were officers for the holy place and officers for God among both Eleazar’s and Ithamar’s descendants.
6 The scribe Shemaiah was a son of Nethanel and a descendant of Levi. Shemaiah recorded their names in the presence of the king, the princes, the priest Zadok, Ahimelech son of Abiathar, and the family leaders of the priests and Levites. One family was chosen for Eleazar, another for Ithamar.
1 Chronicles 25:8
8 They cast lots for their duties, all alike, the small as well as the great, the teacher as well as the pupil.
1 Chronicles 26:13
13 Lots were cast for each gate, according to their families, young and old alike.