Cross reference
Genesis 20:12
12 and also, truly she is my sister, daughter of my father, only not daughter of my mother, and she becometh my wife;
Genesis 11:29
29 And Abram and Nahor take to themselves wives; the name of Abram's wife `is' Sarai, and the name of Nahor's wife `is' Milcah, daughter of Haran, father of Milcah, and father of Iscah.
Genesis 12:13
13 say, I pray thee, thou `art' my sister, so that it is well with me because of thee, and my soul hath lived for thy sake.'
1 Thessalonians 5:22
22 from all appearance of evil abstain ye;