Ezekiel 44:2

² Then said the LORD unto me; This gate shall be shut, it shall not be opened, and no man shall enter in by it; because the LORD, the God of Israel, hath entered in by it, therefore it shall be shut.

Shave the head

'To shave the head' was strictly prohibited for the high-priests and his sons because of the holy representation of hair and of the Nazarite.