Genesis 21:11-12
11
And the thing was very displeasing to Abraham on account of his son.
12
But God said to Abraham, "Be not displeased because of the boy and because of your slave woman. Whatever Sarah says to you, do as she tells you, for x through Isaac shall your offspring be named.
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Cross References
Romans 9:7
And not all are children of Abraham because they are his offspring, but "Through Isaac shall your offspring be named.
Hebrews 11:18
Of whom it was said, "Through Isaac shall your offspring be named.
English Standard Version (ESV) The Holy Bible, English Standard Version Copyright © 2001 by Crossway Bibles, a division of Good News Publishers.