Genesis 18:1-15Revised Standard Version (RSV)
A Son Promised to Abraham and Sarah
18 And the Lord appeared to him by the oaks[a] of Mamre, as he sat at the door of his tent in the heat of the day. 2 He lifted up his eyes and looked, and behold, three men stood in front of him. When he saw them, he ran from the tent door to meet them, and bowed himself to the earth, 3 and said, “My lord, if I have found favor in your sight, do not pass by your servant. 4 Let a little water be brought, and wash your feet, and rest yourselves under the tree, 5 while I fetch a morsel of bread, that you may refresh yourselves, and after that you may pass on—since you have come to your servant.” So they said, “Do as you have said.” 6 And Abraham hastened into the tent to Sarah, and said, “Make ready quickly three measures[b] of fine meal, knead it, and make cakes.” 7 And Abraham ran to the herd, and took a calf, tender and good, and gave it to the servant, who hastened to prepare it. 8 Then he took curds, and milk, and the calf which he had prepared, and set it before them; and he stood by them under the tree while they ate.
9 They said to him, “Where is Sarah your wife?” And he said, “She is in the tent.” 10 The Lord said, “I will surely return to you in the spring, and Sarah your wife shall have a son.” And Sarah was listening at the tent door behind him. 11 Now Abraham and Sarah were old, advanced in age; it had ceased to be with Sarah after the manner of women. 12 So Sarah laughed to herself, saying, “After I have grown old, and my husband is old, shall I have pleasure?” 13 The Lord said to Abraham, “Why did Sarah laugh, and say, ‘Shall I indeed bear a child, now that I am old?’ 14 Is anything too hard[c] for the Lord? At the appointed time I will return to you, in the spring, and Sarah shall have a son.” 15 But Sarah denied, saying, “I did not laugh”; for she was afraid. He said, “No, but you did laugh.”
Genesis 21:1-7Revised Standard Version (RSV)
The Birth of Isaac
21 The Lord visited Sarah as he had said, and the Lord did to Sarah as he had promised. 2 And Sarah conceived, and bore Abraham a son in his old age at the time of which God had spoken to him. 3 Abraham called the name of his son who was born to him, whom Sarah bore him, Isaac. 4 And Abraham circumcised his son Isaac when he was eight days old, as God had commanded him. 5 Abraham was a hundred years old when his son Isaac was born to him. 6 And Sarah said, “God has made laughter for me; every one who hears will laugh over me.” 7 And she said, “Who would have said to Abraham that Sarah would suckle children? Yet I have borne him a son in his old age.”