The story of Isaac being born — after decades of waiting, God does exactly what He said He would, and a laughing old woman holds the son of the promise in her arms.
This account is found in Genesis 21:1–7, the payoff of a promise God had made again and again. Years earlier, in Genesis 18, both Abraham and Sarah had laughed at the idea of a child in their old age. Now that same word comes true, and their laughter turns from doubt into joy.
The Story of Isaac Is Born
The LORD visited Sarah just as He had said, and He did for her exactly what He had spoken. The long wait was over, and the promise God had repeated for years finally came to pass.
Sarah conceived and bore Abraham a son in his old age, at the set time of which God had told him. Everything happened on God’s schedule, not a moment too early and not too late.
Abraham named the son that Sarah bore to him Isaac, which means laughter. The name looked back to the day the promise had seemed impossible, and now it marked the joy of seeing it kept.
When Isaac was eight days old, Abraham circumcised him, just as God had commanded. From his first week, the boy carried the sign of the covenant God had made with his family.
Abraham was a hundred years old when Isaac was born, and Sarah was ninety. By every human measure they were far too old to have a child, which made the birth unmistakably a gift from God.
Sarah said, God has made me laugh, and everyone who hears about this will laugh with me. Once she had laughed in disbelief; now she laughed in wonder and delight.
She marveled that anyone would ever have told Abraham that Sarah would nurse children, yet here she had borne him a son in his old age. What God had promised, He had done.
Key Verses
“And the LORD visited Sarah as he had said, and the LORD did unto Sarah as he had spoken” Genesis 21:1
“For Sarah conceived, and bare Abraham a son in his old age, at the set time of which God had spoken to him” Genesis 21:2
“God hath made me to laugh, so that all that hear will laugh with me” Genesis 21:6
“And Abraham was an hundred years old, when his son Isaac was born unto him” Genesis 21:5
Scripture quotations are from the King James Version (KJV), a public-domain translation.
What the Story of Isaac Is Born Teaches Us
God keeps His promises on His own timing. Abraham and Sarah waited many years, and the delay tested their faith, but the child came at the exact set time God had named. The story teaches that a delayed promise is not a broken one.
Nothing is too hard for the LORD. A hundred-year-old father and a ninety-year-old mother could not produce this child on their own; the birth was plainly God’s work. It shows that God can bring life and hope where people see only closed doors.
The name Isaac, meaning laughter, captures how doubt can turn into joy. Sarah had once laughed in disbelief, and now she laughed for gladness. God is patient with honest struggle and delights to replace our unbelief with wonder.
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Frequently Asked Questions
What happens in the story?
The LORD visits Sarah exactly as He promised, and she conceives and bears a son to Abraham in their old age. They name him Isaac, meaning laughter, and Abraham circumcises him on the eighth day as God commanded. Abraham is one hundred and Sarah is ninety, so the birth is clearly a gift from God.
Why is the baby named Isaac?
Isaac means laughter. Both Abraham and Sarah had laughed earlier when God promised a son in their old age, thinking it impossible. After Isaac is born, Sarah says God has made her laugh with joy, so the name captures how her doubt turned into delight.
How old were Abraham and Sarah when Isaac was born?
Abraham was a hundred years old and Sarah was ninety. At that age having a child was humanly impossible, which is why the Bible presents Isaac’s birth as something only God could do.
Where is this in the Bible?
The birth of Isaac is told in Genesis 21:1-7. The earlier promise and Sarah’s first laugh are found in Genesis 18:10-14, and God first names the coming son Isaac in Genesis 17:19.
Why did God wait so long to give them a son?
The Bible does not give a full reason, but it stresses that Isaac came at the set time God had appointed. The long wait made it unmistakable that the child was God’s doing and not merely a natural event, and it shows God keeps His word even when it takes years.