1 John 1:8

8Ifἐὰνwe should sayεἴπωμενthatὅτιsinἁμαρτίανnotοὐκwe haveἔχομεν,ourselvesἑαυτοὺςwe deceiveπλανῶμενandκαὶtheἡtruthἀλήθειαnotοὐκisἔστινinἐνusἡμῖν.

If we should say that we have no sin, we deceive ourselves and the truth is not in us.