fom: http://www.thebricktestament.com
Abraham left there for the region of the Negeb, and settled between Kadesh and Shur. While staying in Gerar, Abraham said of his wife Sarah, "She is my sister."
Abimelech, however, had not gone near her; so he said, Lord, would you kill someone even if he is upright? Did he not tell me himself, "She is my sister"? And she herself said, "He is my brother."
Yes, I know, God replied in the dream, I myself prevented you from sinning against me. Now send the mans wife back. Understand that if you do not send her back, this means death for you and all yours.
When God made me wander far from my fathers home I said to her, "There is an act of love you can do me: everywhere we go, say of me that I am your brother."
Abimelech took sheep, cattle, men and women slaves, and presented them to Abraham and gave him back his wife. To Sarah he said, Look, I am giving your brother a thousand pieces of silver. This will allay suspicions about you, as far as all the people around you are concerned.
Abraham then interceded with God, and God healed Abimelech, his wife, and his slave-girls, so that they could have children, for Yahweh had made all the women of Abimelechs household barren on account of Sarah, Abrahams wife.