Numbers 19:5-7

⁵And he shall burn that cow, while all men see; and he shall give as well the skin, and the flesh thereof, as the blood, and the dung, to the burning.

⁶Also the priest shall put cedar wood, and hyssop, and red thread dyed twice, into the fire, that burneth the cow.

⁷And then at the last, when the priest’s clothes and his body be washed, he shall enter into the tents, and he shall be defouled, or unclean, till to eventide.