Exodus 28:41-43

Living Bible

⁴¹ Clothe Aaron and his sons with these garments, and then dedicate these men to their ministry by anointing their heads with olive oil, thus sanctifying them as the priests, my ministers. ⁴² Also make linen undershorts for them, to be worn beneath their robes next to their bodies, reaching from hips to knees. ⁴³ These are to be worn whenever Aaron and his sons go into the Tabernacle or to the altar in the Holy Place, lest they be guilty and die. This is a permanent ordinance for Aaron and his sons.