Whoever touches a dead person, the body of a man who has died, and doesn’t purify himself, defiles the LORD’s tabernacle; and that soul shall be cut off from Israel; because the water for impurity was not sprinkled on him, he shall be unclean. His uncleanness is yet on him.
“‘If any man dies very suddenly beside him, and he defiles the head of his separation, then he shall shave his head in the day of his cleansing. On the seventh day he shall shave it.
There were certain men who were unclean because of the dead body of a man, so that they could not keep the Passover on that day, and they came before Moses and Aaron on that day.