Ben Sira 45:17

17 He entrusted the commandments to Aaron's keeping and gave him the authority to make legal decisions and to teach Israel the Law.

Ben Sira 45:17 In-Context

15 Moses ordained Aaron to office by pouring the sacred anointing oil over his head. An eternal covenant was made with him and his descendants, that they would serve the Lord as his priests and bless the people in the Lord's name.
16 The Lord chose Aaron out of the whole human race to offer sacrifices, to burn fragrant incense to remind the Lord of his people, and to take away their sins.
17 He entrusted the commandments to Aaron's keeping and gave him the authority to make legal decisions and to teach Israel the Law.
18 Once, while the people were in the wilderness, an angry group of jealous outsiders conspired against Moses. These were Dathan, Abiram, and Korah with their supporters.
19 The Lord saw what they were doing and became angry, so furious that he performed a miracle and destroyed them in a blazing fire.
Scripture taken from the Good News Translation - Second Edition, Copyright 1992 by American Bible Society. Used by Permission.