Ezekiel 44:20 - Matthew Poole's English Annotations on the Holy Bible

To shave their heads was forbidden, Leviticus 19:27, Leviticus 21:5. Hair is given for an ornament, and the priests should not disfigure themselves, nor imitate idolatrous heathens. Nor suffer their locks to grow long; priding themselves in it, as Absalom, giving ill example by such excess. Shall only poll their heads; when the hair is grown somewhat, they shall trim, cut the ends of their hair, and keep it in moderate size; beside, long hair was a token of a Nazarite's vow, and God would have all holy things and persons kept unmixed and distinguished from other common things.