Leviticus 16:4 - Matthew Poole's English Annotations on the Holy Bible

It is observable that the high priest did not now use his peculiar and glorious robes, but only his linen garments, which were common to him with the ordinary priests. The reason whereof was, either because this was not a day of feasting and rejoicing, but of mourning and humiliation, at which times people were to lay aside their ornaments, Exodus 33:5. Some conceive, that under the linen garments here named are comprehended his more glorious robes also by a synecdoche. But that doth not appear neither from hence, nor from other places alleged. Had only his holy garments been mentioned in general, all might have been understood; but when only the linen apparel is mentioned here, and after, Leviticus 16:23, and when that is so particularly expressed in four several parts of it, and not a word of the other either here or in the rest of the chapter, it seems presumptuous to add them here without any ground or evidence. Or because it was fit he should not exalt, but abase himself, when he was to appear before the Divine Majesty, and therefore he was to come in the meanest of his priestly habits. Or that it might be an evidence of the imperfection of this priesthood and of the great difference between the Levitical and the true High Priest Christ Jesus, whose prerogative alone it is to go into the true holy of holies with his glorious robes, when this must carry thither the characters of his meanness. These are holy garments, because appropriated to a holy and religious use, for which reason other things are called holy. See Exodus 29:31, Exodus 30:25 2 Chronicles 5:5.