English Standard Version
And by this we know that we have come to know him, if we keep his commandments.

American Standard Version
And hereby we know that we know him, if we keep his commandments.

Berean Study Bible
By this we can be sure that we have come to know Him: if we keep His commandments.

Douay-Rheims Bible
And by this we know that we have known him, if we keep his commandments.

English Revised Version
And hereby know we that we know him, if we keep his commandments.

King James Bible
And hereby we do know that we know him, if we keep his commandments.

World English Bible
This is how we know that we know him: if we keep his commandments.

Young's Literal Translation
and in this we know that we have known him, if his commands we may keep;

1 John 2:3 Additional Translations ...