He is not to defile himself

Ezekiel 44:25
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,

Leviticus 10:6-7
Then Moses said to Aaron and his sons Eleazar and Ithamar, “Do not let your hair become disheveled and do not tear your garments, or else you will die, and the LORD will be angry with the whole congregation. But your brothers, the whole house of Israel, may mourn on account of the fire that the LORD has ignited. / You shall not go outside the entrance to the Tent of Meeting, or you will die, for the LORD’s anointing oil is on you.” So they did as Moses instructed.

Numbers 19:11-13
Whoever touches any dead body will be unclean for seven days. / He must purify himself with the water on the third day and on the seventh day; then he will be clean. But if he does not purify himself on the third and seventh days, he will not be clean. / Anyone who touches a human corpse and fails to purify himself defiles the tabernacle of the LORD. That person must be cut off from Israel. He remains unclean, because the water of purification has not been sprinkled on him, and his uncleanness is still on him.

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for those related to him by marriage,

Ezekiel 24:16-18
“Son of man, behold, I am about to take away the desire of your eyes with a fatal blow. But you must not mourn or weep or let your tears flow. / Groan quietly; do not mourn for the dead. Put on your turban and strap your sandals on your feet; do not cover your lips or eat the bread of mourners.” / So I spoke to the people in the morning, and in the evening my wife died. And the next morning I did as I had been commanded.

Genesis 2:24
For this reason a man will leave his father and mother and be united to his wife, and they will become one flesh.

Deuteronomy 24:5
If a man is newly married, he must not be sent to war or be pressed into any duty. For one year he is free to stay at home and bring joy to the wife he has married.

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and so profane himself.

Numbers 18:32
Once you have presented the best part of it, you will not incur guilt because of it. But you must not defile the sacred offerings of the Israelites, or else you will die.’”

Leviticus 22:2-3
“Tell Aaron and his sons to treat with respect the sacred offerings that the Israelites have consecrated to Me, so that they do not profane My holy name. I am the LORD. / Tell them that for the generations to come, if any of their descendants in a state of uncleanness approaches the sacred offerings that the Israelites consecrate to the LORD, that person must be cut off from My presence. I am the LORD.

Ezekiel 22:26
Her priests do violence to My law and profane My holy things. They make no distinction between the holy and the common, and they fail to distinguish between the clean and the unclean. They disregard My Sabbaths, so that I am profaned among them.

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Matthew 8:21-22
Another of His disciples requested, “Lord, first let me go and bury my father.” / But Jesus told him, “Follow Me, and let the dead bury their own dead.”

Luke 9:59-60
Then He said to another man, “Follow Me.” The man replied, “Lord, first let me go and bury my father.” / But Jesus told him, “Let the dead bury their own dead. You, however, go and proclaim the kingdom of God.”

1 Timothy 3:2-3
An overseer, then, must be above reproach, the husband of but one wife, temperate, self-controlled, respectable, hospitable, able to teach, / not dependent on wine, not violent but gentle, peaceable, and free of the love of money.

1 Peter 2:9
But you are a chosen people, a royal priesthood, a holy nation, a people for God’s own possession, to proclaim the virtues of Him who called you out of darkness into His marvelous light.

Hebrews 7:26
Such a high priest truly befits us—One who is holy, innocent, undefiled, set apart from sinners, and exalted above the heavens.

1 Corinthians 9:13-14
Do you not know that those who work in the temple eat of its food, and those who serve at the altar partake of its offerings? / In the same way, the Lord has prescribed that those who preach the gospel should receive their living from the gospel.

1 Corinthians 6:19-20
Do you not know that your body is a temple of the Holy Spirit who is in you, whom you have received from God? You are not your own; / you were bought at a price. Therefore glorify God with your body.