Numbers 19:11-16
He that touches the dead body of any man shall be unclean seven days.
Nave's Topical Index—AKJV

Numbers 31:19
And do you abide without the camp seven days: whoever has killed any person, and whoever has touched any slain, purify both yourselves and your captives on the third day, and on the seventh day.
Nave's Topical Index—AKJV

Leviticus 21:1
And the LORD said to Moses, Speak to the priests the sons of Aaron, and say to them, There shall none be defiled for the dead among his people:
Nave's Topical Index—AKJV