Numbers 3:32

Aaron : a son of Amram; brother of Moses,son of Amram (Kohath Levi); patriarch of Israel's priests,the clan or priestly line founded by Aaron

Eleazar : a son of Eliud; the father of Matthan; an ancestor of Jesus.,a chief priest; son of Aaron,son of Abinadab; caretaker of the Ark at Kiriath-Jearim,son of Dodo the Ahohite; one of David's military elite,son of Mahli the Levite,a priest who participated in the dedication of the wall,a priest under Ezra; son of Phinehas,a layman of the Parosh clan who put away his heathen wife

Levi : members of the tribe of Levi

Levites : relating to Levi and the priesthood given to him,a tribal name describing people and ceremonies as sacred