Sirach 45:15

15 Moses ordained Aaron and anointed him with holy oil; it became an everlasting covenant for him and for his descendants for as long as heaven lasts, to minister to God, to be a priest at the same time, and to bless his people in his name.

Sirach 45:15 In-Context

13 Before Aaron, such beautiful things had not existed. No stranger will ever wear them, but only his sons and his descendants for all time.
14 His sacrifices will be entirely burned up twice daily, for all time.
15 Moses ordained Aaron and anointed him with holy oil; it became an everlasting covenant for him and for his descendants for as long as heaven lasts, to minister to God, to be a priest at the same time, and to bless his people in his name.
16 Moses chose him out of all who were alive to offer fruitful sacrifices to the Lord, incense and a pleasing aroma as a remembrance, to secure reconciliation for the people.
17 By his commandments, the Lord gave him authority over covenants for judgment, to teach Jacob the testimonies, and to enlighten Israel with his Law.
Copyright © 2011 Common English Bible