Genesis 16:6

16:6 Abram said to Sarai, “Since your servant is under your authority, do to her whatever you think best.” Then Sarai treated Hagar harshly, so she ran away from Sarai.

Genesis 16:8

16:8 He said, “Hagar, servant of Sarai, where have you come from, and where are you going?” She replied, “I’m running away from my mistress, Sarai.”

Genesis 17:15

17:15 Then God said to Abraham, “As for your wife, you must no longer call her Sarai; Sarah will be her name.