15 God continued speaking to Abraham, "And Sarai your wife: Don't call her Sarai any longer; call her Sarah. I'll bless her - yes! I'll give you a son by her! Oh, how I'll bless her! Nations will come from her; kings of nations will come from her." 17 Abraham fell flat on his face. And then he laughed, thinking, "Can a hundred-year-old man father a son? And can Sarah, at ninety years, have a baby?" 18 Recovering, Abraham said to God, "Oh, keep Ishmael alive and well before you!" 19 But God said, "That's not what I mean. Your wife, Sarah, will have a baby, a son. Name him Isaac (Laughter). I'll establish my covenant with him and his descendants, a covenant that lasts forever. 20 "And Ishmael? Yes, I heard your prayer for him. I'll also bless him; I'll make sure he has plenty of children - a huge family. He'll father twelve princes; I'll make him a great nation. But I'll establish my covenant with Isaac whom Sarah will give you about this time next year."
22 God finished speaking with Abraham and left. 23 Then Abraham took his son Ishmael and all his servants, whether houseborn or purchased - every male in his household - and circumcised them, cutting off their foreskins that very day, just as God had told him. 24 Abraham was ninety-nine years old when he was circumcised. His son Ishmael was thirteen years old when he was circumcised. Abraham and Ishmael were circumcised the same day together with all the servants of his household, those born there and those purchased from outsiders - all were circumcised with him.
1 God appeared to Abraham at the Oaks of Mamre while he was sitting at the entrance of his tent. It was the hottest part of the day. He looked up and saw three men standing. He ran from his tent to greet them and bowed before them. 3 He said, "Master, if it please you, stop for a while with your servant. I'll get some water so you can wash your feet. Rest under this tree. I'll get some food to refresh you on your way, since your travels have brought you across my path." They said, "Certainly. Go ahead." 6 Abraham hurried into the tent to Sarah. He said, "Hurry. Get three cups of our best flour; knead it and make bread." 7 Then Abraham ran to the cattle pen and picked out a nice plump calf and gave it to the servant who lost no time getting it ready. Then he got curds and milk, brought them with the calf that had been roasted, set the meal before the men, and stood there under the tree while they ate.
9 The men said to him, "Where is Sarah your wife?" He said, "In the tent." 10 One of them said, "I'm coming back about this time next year. When I arrive, your wife Sarah will have a son." Sarah was listening at the tent opening, just behind the man. 11 Abraham and Sarah were old by this time, very old. Sarah was far past the age for having babies. Sarah laughed within herself, "An old woman like me? Get pregnant? With this old man of a husband?" 13 God said to Abraham, "Why did Sarah laugh saying, 'Me? Have a baby? An old woman like me?' Is anything too hard for God? I'll be back about this time next year and Sarah will have a baby." 15 Sarah lied. She said, "I didn't laugh," because she was afraid. But he said, "Yes you did; you laughed."
16 When the men got up to leave, they set off for Sodom. Abraham walked with them to say good-bye. 17 Then God said, "Shall I keep back from Abraham what I'm about to do? Abraham is going to become a large and strong nation; all the nations of the world are going to find themselves blessed through him. Yes, I've settled on him as the one to train his children and future family to observe God's way of life, live kindly and generously and fairly, so that God can complete in Abraham what he promised him." 20 God continued, "The cries of the victims in Sodom and Gomorrah are deafening; the sin of those cities is immense. I'm going down to see for myself, see if what they're doing is as bad as it sounds. Then I'll know."