If we say that we have not sinned, we make him a liar, and his word is not in us.
If we claim we have not sinned, we make him out to be a liar and his word is not in us.
Ἐὰν εἴπωμεν ὅτι οὐχ ἡμαρτήκαμεν, ψεύστην ποιοῦμεν αὐτόν, καὶ ὁ λόγος αὐτοῦ οὐκ ἔστιν ἐν ἡμῖν.
Ean eipōmen oti oych ēmartēkamen, pseystēn poioymen ayton, kai o logos aytoy oyk estin en ēmin.