Numbers 6:5-9

5“They must never cut their hair throughout the time of their vow, for they are holy and set apart to the Lord. Until the time of their vow has been fulfilled, they must let their hair grow long.

6And they must not go near a dead body during the entire period of their vow to the Lord.

7Even 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.

8This requirement applies as long as they are set apart to the Lord.

9“If someone falls dead beside them, the hair they have dedicated will be defiled. They must wait for seven days and then shave their heads. Then they will be cleansed from their defilement.