Numbers 19:20

But the man that shall be unclean
By touching any dead body, bone, or grave:

and shall not purify himself;
with the water of purification:

that soul shall be cut off from among the congregation:
(See Gill on Numbers 19:13).

because he hath defiled the sanctuary of the Lord:
by going into it in his uncleanness:

the water of separation hath not been sprinkled upon him, he is
unclean;
and will remain so, for nothing else could purify him, see ( Numbers 19:13 ) .