Upon whose head the anointing oil was poured, Leviticus 8:12; which was only sprinkled upon inferior priests, blood also being mixed with it, Leviticus 8:30. The garments, to wit, those holy garments which were peculiar to him, as well as those common to others. Shall not uncover his head; this being then the posture of mourners, Leviticus 10:6, though afterwards the custom was changed, and mourners covered their heads, 2 Samuel 15:30 Esther 6:12. Or if this custom was now in use, the meaning may be, he shall not put off the priestly covering or mitre, which was necessary for him to do, if he had put on the mourner's covering upon his head, otherwise the holy covering had been defiled, but he shall continue in the exercise of his office, which is signified by keeping on his priestly garments.
Related Commentaries of Leviticus 21:10
Leviticus 21:10
10 And he that is the high priest among his brethren, upon whose head the anointing oil was poured, and that is consecrated to put on the garments, shall not uncover his head, nor rend his clothes;