Genesis 4:22

4:22 Now Zillah also gave birth to Tubal-Cain, who heated metal and shaped all kinds of tools made of bronze and iron. The sister of Tubal-Cain was Naamah.

Genesis 20:5

20:5 Did Abraham not say to me, ‘She is my sister’? And she herself said, ‘He is my brother.’ I have done this with a clear conscience and with innocent hands!”

Genesis 26:9

26:9 So Abimelech summoned Isaac and said, “She is really your wife! Why did you say, ‘She is my sister’?” Isaac replied, “Because I thought someone might kill me to get her.”

Genesis 29:13

29:13 When Laban heard this news about Jacob, his sister’s son, he rushed out to meet him. He embraced him and kissed him and brought him to his house. Jacob told Laban how he was related to him.