Numbers 19:3-7

And ye shall give her unto Eleazar the priest, that he may bring her forth without the camp, and one shall slay her before his face:

And Eleazar the priest shall take of her blood with his finger, and sprinkle of her blood directly before the tabernacle of the congregation seven times:

And one shall burn the heifer in his sight; her skin, and her flesh, and her blood, with her dung, shall he burn:

And the priest shall take cedar wood, and hyssop, and scarlet, and cast it into the midst of the burning of the heifer.

Then the priest shall wash his clothes, and he shall bathe his flesh in water, and afterward he shall come into the camp, and the priest shall be unclean until the even.