[But] he shall not defile himself, [being] a chief man among his people,.... Which is not to be understood of any lord or nobleman or any chief ruler or governor of the people; for the context speaks only of priests, and not of other personages; besides, such might defile themselves, or mourn for their dead, as Abraham did for Sarah; nor of any husband for his wife, for even a priest, as has been observed, might do this for his wife, and much more a private person; nor is there any need to restrain it, as some Jewish writers do, to an adulterous wife, which a husband might not mourn for, though he might for his right and lawful wife; but there is nothing in the text, neither of an husband, nor a wife: the words are to be interpreted of a priest, and either of him as considered as a person of eminence, consequence, and importance, and sons giving a reason why he should not defile himself for the dead, because he was a principal person among his people to officiate for them in sacred things; wherefore if he did not take care that he was not defiled for the dead, which might often happen, he would be frequently hindered from doing his office for the people, which would be attended with ill consequence to them; and therefore the above cases are only excepted, as being such that rarely happened: or rather the words are to be considered as a prohibition of defiling himself "for [any] chief" , or principal man, lord, ruler, or governor, among his people; even for such an one he was not to defile himself, being no relation of his:to profane himself; make himself unfit for sacred service, or make himself a common person; put himself upon a level with a common private man, and be no more capable of serving at the altar, or doing any part of the work off priest, than such an one.
wymeb leb "in principe populi sui", V. L. so Pesicta & Ben Melech in loc. & Kimchi Sepher Shorash. rad.