Compara traducciones versículo por versículo
Sie sind aus unserer Mitte hervorgegangen, haben aber nicht (wirklich) zu uns gehört; denn wenn sie (in der Tat) zu uns gehörten, wären sie bei uns geblieben; so aber sollte (an ihnen) offenbar werden, daß sie nicht alle von uns sind.
Salieron de nosotros, mas no eran de nosotros; porque si fueran de nosotros, hubieran cierto permanecido con nosotros; pero salieron para que se manifestase que todos no son de nosotros.
They went out from us, but they were not of us; for if they had been of us, they would no doubt have continued with us: but they went out, that they might be made manifest that they were not all of us.
They went out from us, but they didn’t belong to us; for if they had belonged to us, they would have continued with us. But they left, that they might be revealed that none of them belong to us.