And Nadab and Abihu died before the LORD, when they offered strange fire before the LORD, in the wilderness of Sinai, and they had no children: and Eleazar and Ithamar ministered in the priest's office in the sight of Aaron their father.

Their responsibility [was] the ark, the table, the lampstand, the altar, and the vessels of the sanctuary, with which they ministered, and the curtain, and all of its use.

and he hath ministered with his brethren in the tent of meeting, to keep the charge, and doth not do service; thus thou dost to the Levites concerning their charge.'