Matt. 18:18-20—Truly I say to you, Whatever you bind on the earth shall have been bound in heaven, and whatever you loose on the earth shall have been loosed in heaven. Again, truly I say to you that if two of you are in harmony on earth concerning any matter for which they ask, it will be done for them from My Father who is in the heavens. For where there are two or three gathered into My name, there am I in their midst.
For further reading please refer to 李常受文集，一九九一-一九九二，, vol. 3, “Fellowship concerning the Urgent Need of the Vital Groups,” ch. 25, p. 583 and 李常受文集，一九九四-一九九七，, vol. 5, “The Vital Groups,” ch. 1, p. 62.