Exodus 29:28-30

Young's Literal Translation

²⁸ and it hath been for Aaron and for his sons, by a statute age-during from the sons of Israel, for it [is] a heave-offering; and it is a heave offering from the sons of Israel, from the sacrifices of their peace-offerings -- their heave-offering to Jehovah.

²⁹ `And the holy garments which are Aaron's, are for his sons after him, to be anointed in them, and to consecrate in them their hand;

³⁰ seven days doth the priest in his stead (of his sons) put them on, when he goeth in unto the tent of meeting, to minister in the sanctuary.