1 John 2:25

And this is the promise that he hath promised us, even eternal life.
— 1 John 2:25, King James Version

In other translations

World English Bible (WEB)

This is the promise which he promised us, the eternal life.

American Standard Version (ASV)

And this is the promise which he promised us, even the life eternal.

Young's Literal Translation (YLT)

and this is the promise that He did promise us--the life the age-during.