Leviticus 21:1

Holiness and the Priests

1And the Lord said to Moses, “Speak to the priests, the sons of Aaron, and say to them, aNo one shall make himself unclean for the dead among his people,

Numbers 5:2

2Command the people of Israel that they bput out of the camp everyone who is leprous
Leprosy was a term for several skin diseases; see Leviticus 13
or has da discharge and everyone who is eunclean through contact with the dead.

Haggai 2:13

13Then Haggai said, fIf someone who is unclean by contact with a dead body gtouches any of these, does it become unclean?” The priests answered and said, “It does become unclean.”
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