Matthew 12:30He that is not with me is against me; and he that gathereth not with me scattereth abroad.
Luke 9:50And Jesus said unto him, Forbid him not: for he that is not against us is for us.
Mark 9:40For he that is not against us is on our part.
Revelation 3:15-16I know thy works, that thou art neither cold nor hot: I would thou wert cold or hot. So then because thou art lukewarm, and neither cold nor hot, I will spue thee out of my mouth.