Leviticus 16:23-28

And Aaron shall come into the tabernacle of the congregation, and shall put off the linen garments, which he put on when he went into the holy place, and shall leave them there:

Aaron shall come into the tabernacle. On the dismissal of the scape-goat the high priest prepared for the important parts of the service which still remained; and for the performance of these he laid aside his plain linen clothes, and having bathed himself in water, he assumed his pontifical dress. Thus gorgeously attired, he went to present the burnt offerings which were prescribed for himself and the people, consisting of the two kids which had been brought with the sin offerings, but reserved until now. The fat was ordered to be burnt upon the altar, the rest of the carcasses to be cut down and given to some priestly attendants to burn without the camp, in conformity with the general law for the sin offerings (Leviticus 4:8; Leviticus 8:14). The persons employed in burning them, as well as the conductor of the scape-goat, were obliged to wash their clothes and bathe their flesh in water before they were allowed to return into the camp.