Verily I say unto you,.... To them all, what he had said before to Peter; See Gill "Mt 16:19": what is said here, refers to things and not persons, as there also.
Related Commentaries of Matthew 18:18
Matthew 18:18
18 Verily I say unto you, Whatsoever ye shall bind on earth shall be bound in heaven: and whatsoever ye shall loose on earth shall be loosed in heaven.