1 John 2:19

19From amongἐξusἡμῶνthey went outἐξῆλθαν,butἀλλ’notοὐκthey wereἦσανofἐξusἡμῶν·ifεἰforγὰρofἐξusἡμῶνthey had beenἦσαν,they would have remainedμεμενήκεισανἂνwithμεθ’usἡμῶν·Butἀλλ’[it is] so thatἵναit might be made manifestφανερωθῶσινthatὅτιnotοὐκthey areεἰσὶνallπάντεςofἐξusἡμῶν.

They went out from us, but they were not of us; for if they had been of us, they would have remained with us. But [it is] so that it might be made manifest that they are not all of us.