Numbers 6:7

He shall not make himself [ceremonially] unclean for his father, mother, brother, or sister, when they die, because [the responsibility for] his separation to God is on his head.

Numbers 9:6

But there were certain men who were [ceremonially] unclean because of [touching] the dead body of a man, so they could not observe the Passover on that day; so they came before Moses and Aaron that same day.

Leviticus 21:1-2

Then the Lord said to Moses, “Speak to the priests, the sons of Aaron, and say to them:

‘No one shall defile himself [that is, become ceremonially unclean] for the dead among his people [by touching a corpse or assisting in preparing it for burial],

Leviticus 21:10-12

‘But he who is the high priest among his brothers, on whose head the anointing oil has been poured and who has been consecrated to wear the [sacred] garments, shall not uncover his head nor tear his clothes [in mourning],

Ezekiel 44:25

They shall not go to a dead person to defile themselves; except for father or for mother, for son or for daughter, for brother or for sister who has had no husband; they may defile themselves.

Treasury of Scripture Knowledge

Summary

He shall not make himself unclean for his father, or for his mother, for his brother, or for his sister, when they die: because the consecration of his God is upon his head.

General references

Bible References

Unclean

Numbers 9:6
But there were certain men who were [ceremonially] unclean because of [touching] the dead body of a man, so they could not observe the Passover on that day; so they came before Moses and Aaron that same day.
Leviticus 21:1
Then the Lord said to Moses, “Speak to the priests, the sons of Aaron, and say to them:

‘No one shall defile himself [that is, become ceremonially unclean] for the dead among his people [by touching a corpse or assisting in preparing it for burial],
Ezekiel 44:25
They shall not go to a dead person to defile themselves; except for father or for mother, for son or for daughter, for brother or for sister who has had no husband; they may defile themselves.

General references

Leviticus 22:2
“Tell Aaron and his sons to be careful with the holy things (offerings, gifts) which the children of Israel dedicate to Me, so that they do not profane My holy name; I am the Lord.