And the Lord plagued (literally, struck) Pharaoh and his house with great plagues (or strokes, either of disease or death, or some other calamity—an indication that Pharaoh was not entirely innocent) because of Sarai Abram's wife. The effect of this was to lead to the discovery, not through the aid of the Egyptian priests (Josephus), but either through a special revelation granted to him, as afterwards (Genesis 20:6) to Abimelech in a dream (Chrysostom), or through the confession of Sarai herself (A Lapide), or through the servants of Abraham (Kurtz).
And Pharaoh called Abram and said, What is this that thou hast done unto me t why didst thou not tell me she was thy wife? In which case we are bound to believe the monarch that he would not have taken her. Why saidst thou, She is my sister? so I might have taken her to me to wife (which as yet he had not done; an indirect proof both of the monarch's honorable purpose towards Sarai and of Sarai's unsullied purity): now therefore behold thy wife, take her, and go thy way. According to Josephus ('Bell. Jud.' 5. Genesis 9:4) Sarah was only one night in Pharaoh's house; but this is obviously incorrect.