Genesis 12:18 - 19
NIV - 18 So Pharaoh summoned Abram. "What have you done to me?" he said. "Why didn't you tell me she was your wife? 19 Why did you say, 'She is my sister,' so that I took her to be my wife? Now then, here is your wife. Take her and go!
For follow-up discussion and general commentary on the topic. Comments are sorted chronologically.