Leviticus 21:1-4
Then the LORD said to Moses, “Speak to Aaron’s sons, the priests, and tell them that a priest is not to defile himself for a dead person among his people, / except for his immediate family—his mother, father, son, daughter, or brother, / or his unmarried sister who is near to him, since she has no husband. ...

Leviticus 11:31-32
These animals are unclean for you among all the crawling creatures. Whoever touches them when they are dead shall be unclean until evening. / When one of them dies and falls on something, that article becomes unclean; any article of wood, clothing, leather, sackcloth, or any implement used for work must be rinsed with water and will remain unclean until evening; then it will be clean.

Leviticus 5:2-3
Or if a person touches anything unclean—whether the carcass of any unclean wild animal or livestock or crawling creature—even if he is unaware of it, he is unclean and guilty. / Or if he touches human uncleanness—anything by which one becomes unclean—even if he is unaware of it, when he realizes it, he is guilty.

Haggai 2:13
So Haggai asked, “If one who is defiled by contact with a corpse touches any of these, does it become defiled?” “Yes, it becomes defiled,” the priests answered.

Numbers 5:2
“Command the Israelites to send away from the camp anyone with a skin disease, anyone who has a bodily discharge, and anyone who is defiled by a dead body.

Numbers 31:19
All of you who have killed a person or touched the dead are to remain outside the camp for seven days. On the third day and the seventh day you are to purify both yourselves and your captives.

Deuteronomy 21:22-23
If a man has committed a sin worthy of death, and he is executed, and you hang his body on a tree, / you must not leave the body on the tree overnight, but you must be sure to bury him that day, because anyone who is hung on a tree is under God’s curse. You must not defile the land that the LORD your God is giving you as an inheritance.

Ezekiel 44:25-27
A priest must not defile himself by going near a dead person. However, for a father, a mother, a son, a daughter, a brother, or an unmarried sister, he may do so, / and after he is cleansed, he must count off seven days for himself. / And on the day he goes into the sanctuary, into the inner court, to minister in the sanctuary, he must present his sin offering, declares the Lord GOD.

2 Chronicles 29:5
“Listen to me, O Levites,” he said. “Consecrate yourselves now and consecrate the house of the LORD, the God of your fathers. Remove from the Holy Place every impurity.

Isaiah 52:11
Depart, depart, go out from there! Touch no unclean thing; come out from it, purify yourselves, you who carry the vessels of the LORD.

Matthew 23:27
Woe to you, scribes and Pharisees, you hypocrites! You are like whitewashed tombs, which look beautiful on the outside but on the inside are full of dead men’s bones and every kind of impurity.

Luke 11:44
Woe to you! For you are like unmarked graves, which men walk over without even noticing.”

Acts 10:28
He said to them, “You know how unlawful it is for a Jew to associate with a foreigner or visit him. But God has shown me that I should not call any man impure or unclean.

Acts 21:26
So the next day Paul took the men and purified himself along with them. Then he entered the temple to give notice of the date when their purification would be complete and the offering would be made for each of them.

2 Corinthians 6:17
“Therefore come out from among them and be separate, says the Lord. Touch no unclean thing, and I will receive you.”