Sarai's Emuna

When Sarai saw that she was close to eighty years old and had not yet had any children, she said to Avram her husband, "I believe that I have been able to determine prophetically why I cannot have children. People tell me that I can become fertile through medical treatments or magical charms, but I will not make use of them. I am certain that Hashem has prevented me from having children because of some sin that I have committed. I wish to do a good deed by freeing my slave girl, and allowing her to marry you. My anguish at seeing you take a second wife should atone for my sin and Hashem should have mercy on me. Although Hagar is a granddaughter of Nimrod, and therefore a descendant of the accursed Ham, I see prophetically that Hashem will permit you to marry her."

(Yafeh Toar)