Leviticus 8:13

“For Aaron’s sons you shall make tunics; you shall also make sashes for them, and you shall make caps for them, for glory and for beauty.

“You shall put them on Aaron your brother and on his sons with him; and you shall anoint them and ordain them and set them apart as holy, that they may minister to Me as priests.

“Now this is what you shall do to them to set them apart as holy to minister as priests to Me: take one bull from the herd and two rams without blemish,

“And you shall bring his sons near and put tunics on them.

“You shall gird them with sashes, Aaron and his sons, and bind caps on them, and they shall have the priesthood by a perpetual statute. So you shall ordain Aaron and his sons.

“You shall put the holy garments on Aaron and anoint him and set him apart as holy, that he may minister as a priest to Me.

So they came near and carried them still in their tunics to the outside of the camp, as Moses had said.

Moses and Aaron were among His priests, And Samuel was among those who called on His name; They would call upon Yahweh and He would answer them.

“When the priests enter, then they shall not go out into the outer court from the sanctuary without laying there their garments in which they minister, for they are holy. They shall put on other garments; then they shall come near to that which is for the people.”