Leviticus 21:13 - Matthew Poole's English Annotations on the Holy Bible

Or, a virgin, partly for the decency of the type, because as he was a type of Christ, so his wife was a type of the church, which is compared to a virgin, 2 Corinthians 11:2 Revelation 14:4; and partly for greater caution and assurance that his wife was not a defiled or defloured person. This and the following rule belong not to all the priests, for then this were a gross tautology, these same things, or most of them, being expressly forbidden to them, Leviticus 21:7, but only to the high priest, to show that he also, and he especially, is obliged to the same cautions.