Hebrews 11:18
“Of whom it was said, That in Isaac shall thy seed be called:”
But now they desire a better country, that is, an heavenly: wherefore God is not ashamed to be called their God: for he hath prepared for them a city.
By faith Abraham, when he was tried, offered up Isaac: and he that had received the promises offered up his only begotten son,
Of whom it was said, That in Isaac shall thy seed be called:
Accounting that God was able to raise him up, even from the dead; from whence also he received him in a figure.
By faith Isaac blessed Jacob and Esau concerning things to come.
Counter-Arguments
The strongest case that this verse does not belong in this theme.

Cross-References
“And God said unto Abraham, Let it not be grievous in thy sight because of the lad, and because of thy bondwoman; in all that Sarah hath said unto thee, hearken unto her voice; for in Isaac shall thy seed be called.”
“Neither, because they are the seed of Abraham, are they all children: but, In Isaac shall thy seed be called.”
“And God said, Sarah thy wife shall bear thee a son indeed; and thou shalt call his name Isaac: and I will establish my covenant with him for an everlasting covenant, and with his seed after him.”
“And God said unto Abraham, Let it not be grievous in thy sight because of the lad, and because of thy bondwoman; in all that Sarah hath said unto thee, hearken unto her voice; for in Isaac shall thy seed be called.”
“Neither, because they are the seed of Abraham, are they all children: but, In Isaac shall thy seed be called.”