Read Numbers 19:20 Using Other Translations
But the man that shall be unclean, and shall not purify himself, that soul shall be cut off from among the congregation, because he hath defiled the sanctuary of the LORD: the water of separation hath not been sprinkled upon him; he is unclean.
"If the man who is unclean does not cleanse himself, that person shall be cut off from the midst of the assembly, since he has defiled the sanctuary of the LORD. Because the water for impurity has not been thrown on him, he is unclean.
“But those who become defiled and do not purify themselves will be cut off from the community, for they have defiled the sanctuary of the LORD . Since the water of purification has not been sprinkled on them, they remain defiled.