The Promise of Isaac
The central episode of Sarah's life is the birth of Isaac, granted to her long after the age of childbearing. Genesis relates that when she overheard the promise of a son, she laughed within herself, doubting that she and Abraham, both advanced in years, could yet have a child. The promise was nonetheless fulfilled, and she bore Isaac at the appointed time. Earlier, despairing of bearing a child herself, she had given her servant Hagar to Abraham, who bore Ishmael; later, at the feast for Isaac's weaning, Sarah saw Ishmael mocking her son and asked that he and Hagar be sent away, a request to which Abraham acceded only when directed by God.
The New Testament remembers Sarah for her faith: the Epistle to the Hebrews counts her among those who through faith received strength to conceive, and the First Epistle of Peter holds her up as an example of a faithful wife. The Orthodox Church accordingly honors her not for any prophetic office but as a righteous foremother in the line of the promise that led to Christ.