Exodus 29:30

And that son that is priest in his stead shall put them on seven days, just as it was done in the consecration of Aaron, Leviticus 8:35, when he cometh into the Tabernacle of the Congregation to minister in the Holy Place. Aaron was a type of the true High Priest, Jesus Christ, who was anointed with the Holy Ghost without measure, as the true Mediator between God and sinful mankind. The sons of Aaron are types of the believers of the New Testament, who have been made priests before God and the Father and serve Him in holiness and righteousness, as it pleases Him.