Whenever they enter the sacred tent or serve at the altar or enter the holy place, they must wear these shorts, or else they will be guilty and die. This same rule applies to any of their descendants who serve as priests.
Be careful what you do when you enter the house of God. Some fools go there to offer sacrifices, even though they haven't sinned. But it's best just to listen when you go to worship.
Then Moses told Aaron that this was exactly what the LORD had meant when he said: “I demand respect from my priests, and I will be praised by everyone!” Aaron was speechless.