Genesis 21:6, 12
Then Sarah said, "God has made me laugh, and everyone who hears of this will laugh with me." . . .

Genesis 17:19
But God replied, "Your wife Sarah will indeed bear you a son, and you are to name him Isaac. I will establish My covenant with him as an everlasting covenant for his descendants after him.

Genesis 22:2
"Take your son, " God said, "your only son Isaac, whom you love, and go to the land of Moriah. Offer him there as a burnt offering on one of the mountains I will show you."

Joshua 24:3
But I took your father Abraham from beyond the Euphrates and led him through all the land of Canaan, and I multiplied his descendants. I gave him Isaac,

Matthew 1:2
Abraham was the father of Isaac, Isaac the father of Jacob, and Jacob the father of Judah and his brothers.

Acts 7:8
Then God gave Abraham the covenant of circumcision, and Abraham became the father of Isaac and circumcised him on the eighth day. And Isaac became the father of Jacob, and Jacob of the twelve patriarchs.

Romans 9:7
Nor because they are Abraham's descendants are they all his children. On the contrary, "Through Isaac your offspring will be reckoned."

Hebrews 11:18
even though God had said to him, "Through Isaac your offspring will be reckoned."