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1 John 1:10
Robinson-Pierpont Byzantine Textform · Berean Standard Bible
Ἐὰν εἴπωμεν ὅτι οὐχ ἡμαρτήκαμεν, ψεύστην ποιοῦμεν αὐτόν, καὶ ὁ λόγος αὐτοῦ οὐκ ἔστιν ἐν ἡμῖν.
If we say we have not sinned, we make Him out to be a liar, and His word is not in us.