Galatians 4:23
Now the slave woman's son was conceived through human means, while the free woman's son was conceived through divine promise.
Hebrews 11:11
By faith Sarah, even though she was old and barren, received the strength to conceive, because she was convinced that the one who had made the promise was faithful.
Genesis 18:10-14
Then one of them said, "I will certainly return to you in about a year's time. By then, your wife Sarah will have borne a son."
Genesis 21:1-2
The LORD came to Sarah, just as he had said, and the LORD did for Sarah what he had promised.
Romans 9:7-8
and not all of Abraham's descendants are his true descendants. On the contrary, "It is through Isaac that descendants will be named for you."
Genesis 17:15-19
God told Abraham, "As for Sarai your wife, you are not to call her Sarai any longer, because her name is to be Sarah.
Romans 4:18-21
Hoping in spite of hopeless circumstances, he believed that he would become "the father of many nations," just as he had been told: "This is how many descendants you will have."
Romans 10:8
But what does it say? "The message is near you. It is in your mouth and in your heart." This is the message about faith that we are proclaiming:
Galatians 4:28-29
So you, brothers, are children of the promise, like Isaac.