Exodus 28:1-2

And cause thou thy brother Aaron to come vnto thee and his sonnes with him, from among the children of Israel, that he may serue me in the Priestes office: I meane Aaron, Nadab, and Abihu, Eleazar, and Ithamar Aarons sonnes.

Also thou shalt make holy garments for Aaron thy brother, glorious and beautifull.