Numbers 19:17

And they shall take for the unclean of the burnt ashes of purification, and they shall pour upon them running water into a vessel.

And for an unclean person they shall take of the ashes of the burnt heifer of purification for sin, and running water shall be put thereto in a vessel:

“For the unclean, they shall take of the ashes of the burning of the sin offering; and running water shall be poured on them in a vessel.