Numbers 19:20

20 But if those who are unclean do not purify themselves, they must be cut off from the community, because they have defiled the sanctuary of the LORD. The water of cleansing has not been sprinkled on them, and they are unclean.

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.

What does Numbers 19:20 mean?

John Gill's Exposition of the Bible
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 ) .

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