Mark 9:38-40

Young's Literal Translation

³⁸ 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.'

³⁹ And Jesus said, `Forbid him not, for there is no one who shall do a mighty work in my name, and shall be able readily to speak evil of me:

⁴⁰ for he who is not against us is for us;