So Abimelek summoned Isaac and said, "She is really your wife! Why did you say, 'She is my sister'?" Isaac answered him, "Because I thought I might lose my life on account of her."
NIV
And Abimelech called Isaac and said, See here, she is certainly your wife! How did you [dare] say to me, She is my sister? And Isaac said to him, Because I thought, Lest I die on account of her.
AMP
And Abimelech called Isaac, and said, Behold, of a surety she is thy wife; and how saidst thou, She is my sister? And Isaac said unto him, Because I said, Lest I die for her.
KJV