1 John 2:3 in the King James Version
And hereby we do know that we know him, if we keep his commandments.
Context
2 And he is the atoning sacrifice for our sins, and not for ours only, but also for the whole world.
3 This is how we know that we know him: if we keep his commandments.
4 One who says, “I know him,” and doesn’t keep his commandments, is a liar, and the truth isn’t in him.