Numbers 9:6

6But there were some men who were
unclean: When something is clean, it is holy or acceptable to God. When it is unclean, it is unholy (such as an unclean spirit). The term can be used in a ritual sense to apply to moral standards for living.
unclean because of a human corpse, so they could not observe the Passover on that day. b These men came before Moses and Aaron the same day
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