Numbers 19:6

19:6 And the priest must take cedar wood, hyssop, and scarlet wool and throw them into the midst of the fire where the heifer is burning.

Numbers 19:17

19:17 “‘For a ceremonially unclean person you must take some of the ashes of the heifer burnt for purification from sin and pour fresh running water over them in a vessel.

Numbers 16:37

16:37 “Tell Eleazar son of Aaron the priest to pick up the censers out of the flame, for they are holy, and then scatter the coals of fire at a distance.