"And I will give unto thee the keys of the king-
dom of heaven:
and whatsoever
thou shalt bind on
earth
shall be bound in
heaven: and
whatsoever
thou shalt loose
on earth shall be
loosed in heaven" Matthew 16:19

Peter wasn't the only one to get this promise;
as seen in Matthew 18:18 the keys of the
kingdom of heaven, which included power to
bind and to loose was also given to the apostles.