Judges 9:18

9:18 But you have attacked my father’s family today. You murdered his seventy legitimate sons on one stone and made Abimelech, the son of his female slave, king over the leaders of Shechem, just because he is your close relative.

Genesis 20:2

20:2 Abraham said about his wife Sarah, “She is my sister.” So Abimelech, king of Gerar, sent for Sarah and took her.