Numbers 19:10

19:10 And he that gathereth the ashes of the heifer shall wash his clothes, and be unclean until the even: and it shall be unto the children of Israel, and unto the stranger that sojourneth among them, for a statute for ever.

Numbers 19:22

19:22 And whatsoever the unclean [person] toucheth shall be unclean; and the soul that toucheth [it] shall be unclean until even.