Miracles: Catalogue of The Conception of Isaac
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Genesis 17:17
Abraham fell facedown. Then he laughed and said to himself, “Can a child be born to a man who is a hundred years old? Can Sarah give birth at the age of ninety?”
Genesis 18:12
So she laughed to herself, saying, “After I am worn out and my master is old, will I now have this pleasure?”
Genesis 21:2
So Sarah conceived and bore a son to Abraham in his old age, at the very time God had promised.