(1) Sarai, Abram’s wife, had borne him no children. She had an Egyptian maidservant whose name was Hagar. (2) And Sarai said to Abram, “Look, Adonai has kept me from bearing. Consort with my maid; perhaps I shall have a son through her.” And Abram heeded Sarai’s request. (3) So Sarai, Abram’s wife, took her maid, Hagar the Egyptian—after Abram had dwelt in the land of Canaan ten years—and gave her to her husband Abram as concubine. (4) He cohabited with Hagar and she conceived; and when she saw that she had conceived, her mistress was lowered in her esteem. (5) And Sarai said to Abram, “The wrong done me is your fault! I myself put my maid in your bosom; now that she sees that she is pregnant, I am lowered in her esteem. Adonai decide between you and me!” (6) Abram said to Sarai, “Your maid is in your hands. Deal with her as you think right.” Then Sarai treated her harshly, and she ran away from her.
God bade him [Abram] be assured that, as in all else, he had been let out of Mesopotamia for his welfare, so children would come to him; and by God’s command Sarra brought to his bed on of her handmaidens, an Egyptian named Agar, that he might have children by her. Becoming pregnant, this servant had the insolence to abuse Sarra, assuming queenly airs as though the dominion were to pass to her unborn son. Abraham having thereupon consigned her to Sarra for chastisement, she, unable to ensure her humiliations, resolved to fly and entreated God to take pity on her…
It was taught by R Huna, R Idi and R Abin in the name of R Meir: so that their husbands might derive pleasure from them, for when a woman is with child, she is disfigured and lacks grace. Thus the whole ninety years that Sarah did not bear she was like a bride in her canopy. Ladies us to come and inquire how she was, and she would say to them, ‘Go and ask about the welfare of this poor woman [Hagar].’ Hagar would tell them, ‘My mistress Sarai is not inwardly what she is outwardly: she appears to be a righteous woman, but she is not. For had she been a righteous woman, see how many have passed without her conceiving, whereas I conceived in one night.’ Said Sarah, ‘Shall I pay heed to this woman and argue with her! No; I will argue the matter with her master.
She did too much to her and she worked her ruthlessly, and it is possible that she hit her and cursed her until she could not endure it and she fled from before her. Sarah displayed in this neither the quality and morality nor the quality of morality and nor the quality of poetry. Not morality because even though Abraham gave up his honor for her and said to her, ‘Do what is right in your eyes,’ she [Sarah] should have retrained herself for his honor and should not have tortured her [Hagar]. And not piety and compassion, for a person should not do whatever is in their power to those who are subject to their authority…
Did you not know that Sarah was arranged for you from the time her mother conceived her and she is both your partner and a woman of your covenant. Sarah is not called your servant, rather your wife, and Hagar is not called you wife, rather your servant.
Sarra at the first, when Ishmael was born of her servant Hagar, cherished him with an affection no less than if he had been her own son...but when she herself gave birth to Isaac, she held it wrong that her boy should be brought up with Ishmael and might do him an injury after their father was dead. She therefore urged Avraham to send him and his mother away…