1 John 2:1-5

1My little children, these things I write to you, that ye sin not. And if any man sinneth, we have an advocate with the Father, Jesus Christ the righteous: 2And he is the propitiation for our sins: and not for ours only, but also for the sins of the whole world.

3And by this we do know that we know him, if we keep his commandments. 4He that saith, I know him, and keepeth not his commandments, is a liar, and the truth is not in him. 5But whoever keepeth his word, in him verily is the love of God perfected: by this we know that we are in him.