Genesis 26:7

When the men of that place asked him about his wife, he said, 'She is my sister,' because he was afraid to say, 'She is my wife.' He thought, 'The men of this place might kill me on account of Rebekah, because she is beautiful.'

(New International Version)

When the men of the place asked about his wife, he said, 'She is my sister,' for he was afraid to say, 'my wife,' thinking, 'the men of the place might kill me on account of Rebekah, for she is beautiful.'

(New American Standard Bible)

And the men of the place asked him of his wife; and he said, She is my sister: for he feared to say, She is my wife; lest, said he, the men of the place should kill me for Rebekah; because she was fair to look upon.

(King James Version)