Exodus 28:42-43

New Catholic Bible

⁴² “Make linen undergarments to cover their nakedness. They must reach from their hips to their thighs. ⁴³ Aaron and his sons will put them on whenever they enter into the meeting tent or when they approach the altar to minister in the sanctuary, so that they may not incur guilt and die. This shall be a perpetual statute for him and his offspring forever.