Numbers 19:1-4

Then the Lord spoke to Moses and Aaron, saying, “This is the statute of the law which the Lord has commanded, saying, ‘Speak to the sons of Israel that they bring you an unblemished red heifer in which there is no defect and on which a yoke has never been mounted. And you shall give it to Eleazar the priest, and it shall be brought outside the camp and be slaughtered in his presence. And Eleazar the priest shall take some of its blood with his finger and sprinkle some of its blood toward the front of the tent of meeting seven times.