Matthew Poole and continuators on Leviticus 21:9

9 And the daughter of any priest, if she profane her self by playing the whore, she profaneth her father , she shall be burnt with fire .

And by analogy his son also, and his wife, because the reason of the law here added concerns all. And nothing is more common than to name one kind for the rest of the same nature, as also is done Levit. 18.

(i. e.) Exposeth his person and office and consequently religion, one of whose prime ministers he is, to contempt.

Which was the severest of all the kinds of punishments among the Iews. Whereby God would shew, both the greatness of their sins who stand in nearer relation to God than others, and how far God is from allowing sin in those who are nearest to him.