Exodus 28:42-43

42You shall make for them alinen undergarments to cover their naked flesh. They shall reach from the hips to the thighs; 43and they shall be on Aaron and on his sons when they go into the tent of meeting or when they come near the altar to minister in the Holy Place, lest they bbear guilt and die. cThis shall be a statute forever for him and for his offspring after him.

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