Genesis 17:15-21 Holman Christian Standard Bible (HCSB)
15 God said to Abraham, “As for your wife Sarai, do not call her Sarai, for Sarah[a] will be her name. 16 I will bless her; indeed, I will give you a son by her. I will bless her, and she will produce nations; kings of peoples will come from her.”
17 Abraham fell facedown. Then he laughed and said to himself, “Can a child be born to a hundred-year-old man? Can Sarah, a ninety-year-old woman, give birth?” 18 So Abraham said to God, “If only Ishmael were acceptable to You!”[b]
19 But God said, “No. Your wife Sarah will bear you a son, and you will name him Isaac.[c] I will confirm My covenant with him as an everlasting covenant for his future offspring. 20 As for Ishmael, I have heard you. I will certainly bless him; I will make him fruitful and will multiply him greatly. He will father 12 tribal leaders, and I will make him into a great nation. 21 But I will confirm My covenant with Isaac, whom Sarah will bear to you at this time next year.”
Genesis 18:6-15 Holman Christian Standard Bible (HCSB)
6 So Abraham hurried into the tent and said to Sarah, “Quick! Knead three measures[a] of fine flour and make bread.”[b] 7 Meanwhile, Abraham ran to the herd and got a tender, choice calf. He gave it to a young man, who hurried to prepare it. 8 Then Abraham took curds[c] and milk, and the calf that he had prepared, and set them before the men. He served[d] them as they ate under the tree.
9 “Where is your wife Sarah?” they asked him.
“There, in the tent,” he answered.
10 The Lord said, “I will certainly come back to you in about a year’s time, and your wife Sarah will have a son!” Now Sarah was listening at the entrance of the tent behind him.
11 Abraham and Sarah were old and getting on in years.[e] Sarah had passed the age of childbearing.[f] 12 So she laughed to herself: “After I have become shriveled up and my lord is old, will I have delight?”
13 But the Lord asked Abraham, “Why did Sarah laugh, saying, ‘Can I really have a baby when I’m old?’ 14 Is anything impossible for the Lord? At the appointed time I will come back to you, and in about a year she will have a son.”
15 Sarah denied it. “I did not laugh,” she said, because she was afraid.
But He replied, “No, you did laugh.”
Hebrews 11:11 Holman Christian Standard Bible (HCSB)
11 By faith even Sarah herself, when she was unable to have children, received power to conceive offspring, even though she was past the age, since she[a] considered that the One who had promised was faithful.