On the eighth day Namely, from the day of his consecration, or when the seven days of his consecration were ended. The eighth day is famous in Scripture for the perfecting and purifying both of men and beasts. See Leviticus 12:2-3; Leviticus 14:8-10; Leviticus 15:13-14; Leviticus 22:27. And the elders of Israel All the congregation were called to be witnesses of Aaron's instalment into his office, to prevent their murmurings and contempt; which being done, the elders were now sufficient to be witnesses of his first execution of his office.
Related Commentaries of Leviticus 9:1
Leviticus 9:1
1 And it came to pass on the eighth day, that Moses called Aaron and his sons, and the elders of Israel;