Sarah was the wife of the Old Testament Patriarch Abraham and the mother of Isaac. At first she was called Sarai, and her name was changed to Sarah (Genesis 17:15-16). The three men who visited Abraham at the oak of Mamre told her that she would conceive and have a son (Genesis 18:10). She did not believe them at first, since she and her husband were old, but they insisted that she would bear a son in the spring. Their prediction was fulfilled, and God did as He had promised (Genesis 21:1-3). Saint Andrew Rublev depicts the three men as angels in his most famous icon. Sarah is praised in the New Testament for her faith (Hebrews 11:11) and also for her obedience (I Peter 3:6).