Mark Chapter 9, Verse 38
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38: απεκριθη δε αυτω ο ιωαννης λεγων διδασκαλε ειδομεν τινα εν τω ονοματι σου εκβαλλοντα δαιμονια ος ουκ ακολουθει ημιν και εκωλυσαμεν αυτον οτι ουκ ακολουθει ημιν
38: And John answered him, saying, Master, we saw one casting out
devils in thy name, and he followeth not us: and we forbad
him, because he followeth not us.
38: But Jesus said: Do not forbid him. For there is no man that doth a
miracle in my name and can soon speak ill of me.
We saw one, etc. There is no improbability in supposing that this might have been one of the disciples of John, or one of the seventy whom Jesus had sent out, and who, though he did not personally attend on Jesus, yet had the power of working miracles. There is no evidence that he was merely an exorcist, or that he used the name of Jesus merely as a pretence.

