Now Sarai, Abram's wife, had borne him no children. So after Abram had been living in Canaan ten years, Sarai his wife took her Egyptian maidservant Hagar and gave her to her husband to be his wife. He sleep with Hagar and she conceived. From that moment, many problems appeared in the home of Sarai and Abram. Then Sarai mistreated Hagar so she fled from her. The angel of the Lord found Hagar near a spring in the desert. And he said: “Hagar, servant of Sarai, where did you come from, and where are you going?” "I'm running away from my mistress Sarai," she answered. Then the angel of the Lord told her: "Go back to your mistress and submit to her.” The angel added: “I will so increase your descendants that they will be too numerous to count.” The angel of the Lord also said to her: “You are now with child and you will have a son. You shall name him Ishmael, for the Lord has heard of your misery. He will be a wild donkey of a man; and he will live in hostility toward all his brothers.” She gave this name to the Lord who spoke to her: "You are the God who sees me.” Abram was eighty-six years old when Hagar bore him Ishmael. 

Genesis 16