Exodus 30:19-21
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19Aaron and his sons shall wash their hands and their feet from it; 20when they enter the tent of meeting, they shall wash with water, so that they do not die; or when they approach the altar to minister, by offering up in smoke a fire sacrifice to the Lord. 21So they shall wash their hands and their feet, so that they do not die; and it shall be a permanent statute for them, for Aaron and his descendants throughout their generations.”