Numbers 19:2-9

2“This is the ordinance of the law which the Lord has commanded, saying: ‘Speak to the children of Israel, that they bring you a red heifer without blemish, in which there is no defect and on which a yoke has never come.

3You shall give it to Eleazar the priest, that he may take it outside the camp, and it shall be slaughtered before him;

4and Eleazar the priest shall take some of its blood with his finger, and sprinkle some of its blood seven times directly in front of the tabernacle of meeting.

5Then the heifer shall be burned in his sight: its hide, its flesh, its blood, and its offal shall be burned.

6And the priest shall take cedar wood and hyssop and scarlet, and cast them into the midst of the fire burning the heifer.

7Then the priest shall wash his clothes, he shall bathe in water, and afterward he shall come into the camp; the priest shall be unclean until evening.

8And the one who burns it shall wash his clothes in water, bathe in water, and shall be unclean until evening.

9Then a man who is clean shall gather up the ashes of the heifer, and store them outside the camp in a clean place; and they shall be kept for the congregation of the children of Israel for the water of purification; it is for purifying from sin.