Luke 9:49-50
And John, answering, said: Master, we saw a certain man casting out devils in thy name: and we forbade him, because he followeth not with us. And Jesus said to him: Forbid him not: for he that is not against you is for you.
That passage of scripture along with it’s identical account in Mark helped me move past the fog of exclusive sectanarianism I grew up in. Long unrelated story to this thread but I had to toss that in :-)