He is not to marry a widow, a divorced woman, or one defiled by prostitution. He is to marry a virgin from his own people,
More was expected from a priest than from other people, but more from the high priest than from other priests, because upon his head the anointing oil was poured, and he was consecrated to put on the garments (Lev 21:10), both which were typical of the anointing and adorning of the Lord Jesus, with all the gifts and graces of the Holy Spirit, which he received without measure.
Commenting on Leviticus 21:10-15
A widow,.... The high priest might not marry, whether the widow of a priest or of an Israelite, as Aben Ezra, that is, of any Israelite that was not of the priesthood; and this, whether a widow after espousals, or after marriage, as runs the Jewish canon (u); the meaning is, that if she was betrothed to a man, and that man died before he...
A widow, or a divorced woman, or profane, [or] an harlot, these shall he not take: but he shall take a virgin of his own people to wife. (k) Not only of his tribe, but of all Israel.