Numbers 6:7

New Living Translation

Even if the dead person is their own father, mother, brother, or sister, they must not defile themselves, for the hair on their head is the symbol of their separation to God.

Cross References

Ezekiel 44:25

“A priest must not defile himself by being in the presence of a dead person unless it is his father, mother, child, brother, or unmarried sister. In such cases it is permitted.

Numbers 6:8

This requirement applies as long as they are set apart to the Lord.

Numbers 9:6

But some of the men had been ceremonially defiled by touching a dead body, so they could not celebrate the Passover that day. They came to Moses and Aaron that day