Leviticus 21:10-12
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10‘The priest who is highest among his brothers, on whose head the anointing oil has been poured and who has been consecrated to wear the garments, shall not uncover his head nor tear his clothes; 11nor shall he approach any dead person, nor defile himself even for his father or his mother; 12nor shall he leave the sanctuary nor profane the sanctuary of his God, for the consecration of the anointing oil of his God is on him; I am the Lord.