Cross reference
Genesis 20:12
12 And, in fact, she is my sister, the daughter of my father, but not the daughter of my mother; and she became my wife:
Genesis 11:29
29 And Abram and Nahor took wives for themselves: the name of Abram's wife was Sarai, and the name of Nahor's wife was Milcah, the daughter of Haran, the father of Milcah and Iscah.
Genesis 12:13
13 Say, then, that you are my sister, and so it will be well with me because of you, and my life will be kept safe on your account.
1 Thessalonians 5:22
22 Keep from every form of evil.