Sarah, Abraham’s wife, was ninety years old when the three angels were sent to tell her that she would finally have a child. In this painting, she is shown sitting in her tent while the angels wait outside for Abraham to bring them food. Genesis describes the scene: …”And they, (the three angels) said unto him, (Abraham) “Where is Sarah thy wife?” and he said: “Behold - in the tent! “ And he said: “I will surely return to you at this time next year, and behold Sarah, your wife will have a son.” Now Sarah was listening at the entrance of the tent…“ “Now Abraham and Sarah were old, well on in years; the manner of women had ceased to be with Sarah - And Sarah laughed at herself, saying: ‘After I have withered shall I again have delicate skin? And my husband is old !’ ” The lunette describes an amazing occurrence related in the Midrash. After the birth of Isaac, Sarah and Abraham’s son, the community was convinced that because Sarah and Abraham were so old, Isaac was not their true son, but a foundling. Miraculously, the milk of all the mothers dried up and none of the women were able to nurse their babies, except for Sarah, whose milk became so plentiful that she nursed all the babies who were brought to her. (http://janetshafner.com/biblical-visions/Sarah.jpg.php)