Read Genesis 12:13 Using Other Translations
Say, I pray thee, thou art my sister: that it may be well with me for thy sake; and my soul shall live because of thee.
Say you are my sister, that it may go well with me because of you, and that my life may be spared for your sake."
So please tell them you are my sister. Then they will spare my life and treat me well because of their interest in you.”