§ 02 · King James Bible
Galatians 3:16
Now to Abraham and his seed were the promises made. He saith not, And to seeds, as of many; but as of one, And to thy seed, which is Christ.
Simple English
The promise was given to Abraham and his single descendant. It doesn't refer to many descendants, but specifically to one - Christ.
* Work in progress - there may be occasional inaccuracies