Exodus 19:22

19:22 Let the priests also, who approach the Lord, sanctify themselves, lest the Lord break through against them.”

Exodus 30:30

30:30 “You are to anoint Aaron and his sons and sanctify them, so that they may minister as my priests.

Exodus 31:10

31:10 the woven garments, the holy garments for Aaron the priest and the garments for his sons, to minister as priests,