And the LORD afflicted Pharaoh and his house with great plagues because of Sarai Abram's wife.
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Ambrose of Milan
This passage is a great witness and demonstration of the necessity of maintaining chastity, exhorting everyone to show himself chaste, not to long for the bed of another and not to seduce the wife of another, counting on the hope of not being discovered and of going unpunished. It exhorts all not to let themselves be tempted by neglect … or by a prolonged absence. God, the defender of marriage, is present. From him nothing remains hidden, nothing escapes him, and no one can make sport of him. God takes on the task of the absent husband and maintains the sentinels. Indeed, even without sentinels he surprises the guilty before he puts into action what he has premeditated. In the soul of each one, in the mind of all he recognizes the guilt. Adulterer, even if you have deceived the husband, you do not deceive God. Even if you have escaped from the husband, even if you have made sport of the judge of the tribunal, you do not escape from the judge of the whole world. He punishes with greater...
Scourged Pharao with unusual pains, sterility that he might easily perceive that his taking Sarai was displeasing to God. (Haydock)
He did not intend to commit adultery indeed, but his conduct was tyrannical and oppressive to the stranger, whom God protects, Psalm xliv. (Menochius)