Exodus 28:42-43

New International Version

⁴² “Make linen undergarments^(A) as a covering for the body, reaching from the waist to the thigh. ⁴³ Aaron and his sons must wear them whenever they enter the tent of meeting^(B) or approach the altar to minister in the Holy Place,^(C) so that they will not incur guilt and die.^(D)

“This is to be a lasting ordinance^(E) for Aaron and his descendants.