Luke 9:50

48 And said unto them, Whosoever shall receive this child in my name receiveth me: and whosoever shall receive me receiveth him that sent me: for he that is least among you all, the same shall be great.

49 And John answered and said, Master, we saw one casting out devils in thy name; and we forbad him, because he followeth not with us.

And Jesus said unto him, Forbid him not: for he that is not against us is for us.

51 And it came to pass, when the time was come that he should be received up, he stedfastly set his face to go to Jerusalem,

52 And sent messengers before his face: and they went, and entered into a village of the Samaritans, to make ready for him.

Do read the surrounding verses too, because the context often says more than a single verse.

Compare

BSB
“Do not stop him,” Jesus replied, “for whoever is not against you is for you.”
KJV
And Jesus said unto him, Forbid him not: for he that is not against us is for us.
WEB
Jesus said to him, “Don’t forbid him, for he who is not against us is for us.”
ASV
But Jesus said unto him, Forbid [him] not: for he that is not against you is for you.
DARBY
And Jesus said to him, Forbid [him] not, for he that is not against you is for you.
BLB
And Jesus said to him, “Do not forbid [it]; for whoever is not against you⁺ is for you⁺.”
ÅB
Og Jesus sa til ham: Forbyd det ikke! for den som ikke er imot dere, er med dere.
OTB
"Ikke stopp ham," sa Jesus, "for den som ikke er imot dere, er for dere."
B1930
Og Jesus sa til ham: Forbyd det ikke! for den som ikke er imot eder, er med eder.

Study notes (Tyndale)

Original text and word study

Cross references