וְאֶת־אַהֲרֹ֤ן וְאֶת־בָּנָיו֙ תַּקְרִ֔יב אֶל־פֶּ֖תַח אֹ֣הֶל מוֹעֵ֑ד וְרָחַצְתָּ֥ אֹתָ֖ם בַּמָּֽיִם׃
And Aaron and his sons thou shalt bring unto the door of the tent of meeting, and shalt wash them with water.
Read midrashic interpretation of Exodus 29:4: and classical rabbinic exegesis.