'Priesthood' in the Bible

These are the names of the sons of Aaron, the anointed priests, who were consecrated to exercise the priesthood.

And Nadab and Abihu died before Jehovah when they offered strange fire before Jehovah in the wilderness of Sinai, and they had no sons; and Eleazar and Ithamar exercised the priesthood in the presence of Aaron their father.

that he has brought thee near, and all thy brethren the sons of Levi with thee; and seek ye now the priesthood also?

And Jehovah said to Aaron, Thou and thy sons and thy father's house with thee shall bear the iniquity of the sanctuary; and thou and thy sons with thee shall bear the iniquity of your priesthood.

But thou and thy sons with thee shall attend to your priesthood for all that concerneth the altar, and for that which is inside the veil; and ye shall perform the service: I give you your priesthood as a service of gift, and the stranger that cometh near shall be put to death.

And he shall have it, and his seed after him, the covenant of an everlasting priesthood; because he was jealous for his God, and made atonement for the children of Israel.