Romans 15:21

Rather, as it is written: “Those who were not told about Him will see, and those who have not heard will understand.”

Note Isaiah 52:15 (see also LXX)

BSB · Berean Standard Bible
But as it is written, To whom he was not spoken of, they shall see: and they that have not heard shall understand.
KJV · King James Version
But, as it is written, “They will see, to whom no news of him came. They who haven’t heard will understand.”
WEB · World English Bible
but, as it is written, They shall see, to whom no tidings of him came, And they who have not heard shall understand.
ASV · American Standard Version

Related passages

From the Treasury of Scripture Knowledge, grouped by the word they explain.

Romans 15:21
Isaiah 52:15; Isaiah 65:1