New Living Translation
even though God had told him, “Isaac is the son through whom your descendants will be counted.”

American Standard Version
even he to whom it was said, In Isaac shall thy seed be called:

Berean Study Bible
even though God had said to him, “Through Isaac your offspring will be reckoned.”

Douay-Rheims Bible
(To whom it was said: In Isaac shall thy seed be called.)

English Revised Version
even he to whom it was said, In Isaac shall thy seed be called:

King James Bible
Of whom it was said, That in Isaac shall thy seed be called:

World English Bible
even he to whom it was said, "In Isaac will your seed be called;"

Young's Literal Translation
of whom it was said -- 'In Isaac shall a seed be called to thee;'

Hebrews 11:18 Additional Translations ...