Charles Spurgeon Commentary Matthew 18:19

"Again I say unto you, that if two of you shall agree on earth as touching anything that they shall ask, it shall be done for them of my Father who is in heaven." — Matthew 18:19 (ASV)

Thus the Savior sets His seal upon assemblies of the faithful, even of the smallest kind, not only in their acts of discipline, but in their intercessions. Note how tenderly Jesus speaks of His followers, If two of you. Poor as you are, if two of you agree in prayer on earth, my Father which is in heaven will listen to your pleading. Prayer should be matter for previous consideration and persons about to join in prayer should agree as touching anything that they shall ask. Then they come together with an intelligent design, seeking a known blessing, and agreeing to combine their desires and their faith in reference to the one chosen object. Two believers united in holy desire and solemn prayer will have great power with God.

Instead of despising the verdict of so small a gathering, we ought to respect it, since the Father does so. Note the power of combined prayer. There is no excuse for giving up prayer-meetings while there are two praying people in the place, for two can prevail with God. Of course, more is needed than a cold agreement that certain things are desirable. There must be persistence and faith.