Afterward Jesus found him in the temple, and said to him, "Behold, you are made well. Sin no more, so that nothing worse happens to you."
And He begins to talk to them now, emphasizing what He's saying with these words verily, verily. And the repetition of the word is for emphasis, it's, "Alright, now hear this." I mean, it's really calling their attention to what I'm about to say.