New Living Translation
John said to Jesus, “Teacher, we saw someone using your name to cast out demons, but we told him to stop because he wasn’t in our group.”

American Standard Version
John said unto him, Teacher, we saw one casting out demons in thy name; and we forbade him, because he followed not us.

Berean Study Bible
John said to Him, “Teacher, we saw someone else driving out demons in Your name, and we tried to stop him, because he does not accompany us.”

Douay-Rheims Bible
John answered him, saying: Master, we saw one casting out devils in thy name, who followeth not us, and we forbade him.

English Revised Version
John said unto him, Master, we saw one casting out devils in thy name: and we forbade him, because he followed not us.

King James Bible
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.

World English Bible
John said to him, "Teacher, we saw someone who doesn't follow us casting out demons in your name; and we forbade him, because he doesn't follow us."

Young's Literal Translation
And John did answer him, saying, 'Teacher, we saw a certain one in thy name casting out demons, who doth not follow us, and we forbade him, because he doth not follow us.'

Mark 9:38 Additional Translations ...