Matthew 18:17-20

17And if he shall neglect to hear them, tell it unto the Assembly: but if he neglect to hear the Assembly, let him be unto thee as an heathen man and a publican.

18Verily I say unto you, Whatsoever ye shall bind on earth shall be that which is bound in heaven: and whatsoever ye shall loose on earth shall be that which is loosed in heaven.

19Again I say unto you, That if two of you shall agree on earth as touching any thing that they shall ask, it shall be done for them of my Father which is in heaven.

20For where two or three are gathered together in my name, there am I in the midst of them.