New Revised Standard Version
One, the child of the slave, was born according to the flesh; the other, the child of the free woman, was born through the promise.

Contemporary English Version
The son of the slave woman was born in the usual way. But the son of the free woman was born because of God's promise.

New American Bible
The son of the slave woman was born naturally, the son of the freeborn through a promise.

Douay-Rheims Bible
But he who was of the bondwoman was born according to the flesh: but he of the free woman was by promise.

But he who was of the bondwoman was born according to the flesh: but he of the free woman was by promise.

born.

Romans 9:7,8 Neither are all they that are the seed of Abraham, children: but in Isaac shall thy seed be called. . . .

but.

Genesis 17:15-19 God said also to Abraham: Sarai thy wife thou shalt not call Sarai, but Sara. . . .

Genesis 18:10-14 And he said to him: I will return and come to thee at this time, life accompanying, and Sara, thy wife, shall have a son. Which when Sara heard, she laughed behind the door of the tent. . . .

Genesis 21:1,2 And the Lord visited Sara, as he had promised: and fulfilled what he had spoken. . . .

Romans 4:18-21 Who against hope believed in hope; that he might be made the father of many nations, according to that which was said to him: So shall thy seed be. . . .

Romans 10:8 But what saith the scripture? The word is nigh thee; even in thy mouth and in thy heart. This is the word of faith, which we preach.

Hebrews 11:11 By faith also Sara herself, being barren, received strength to conceive seed, even past the time of age: because she believed that he was faithful who had promised,