Genesis 16:2

16:2 So Sarai said to Abram, “Since the Lord has prevented me from having children, have sexual relations with my servant. Perhaps I can have a family by her.” Abram did what Sarai told him.

Genesis 32:20

32:20 You must also say, ‘In fact your servant Jacob is behind us.’” Jacob thought, “I will first appease him by sending a gift ahead of me. After that I will meet him. Perhaps he will accept me.”