Gen 26:7

וַֽיִּשְׁאֲל֞וּ אַנְשֵׁ֤י הַמָּקוֹם֙ לְאִשְׁתּ֔וֹ וַיֹּ֖אמֶר אֲחֹ֣תִי הִ֑וא כִּ֤י יָרֵא֙ לֵאמֹ֣ר אִשְׁתִּ֔י פֶּן־יַֽהַרְגֻ֜נִי אַנְשֵׁ֤י הַמָּקוֹם֙ עַל־רִבְקָ֔ה כִּֽי־טוֹבַ֥ת מַרְאֶ֖ה הִֽיא׃

But when the men of that place asked about his wife, he said, “She is my sister.” For he was afraid to say, “She is my wife,” since he thought to himself, “The men of this place will kill me on account of Rebekah, because she is so beautiful.”