'Mistress' in the Bible

He had sex with Hagar, and she became pregnant. When she realized that she was pregnant, she looked with contempt on her mistress.

"Hagar, servant of Sarai," he asked, "Where are you coming from and where are you going?" She answered, "I am running away from my mistress Sarai."

The angel of the LORD told her, "You must go back to your mistress and submit to her authority."