Again I say unto you— Further to encourage good men to be very earnest in their endeavours to bring sinners to repentance, he assured them, that if they prayed to God for it, he would hear them, provided it was agreeable to the wise ends of his providence. Perhaps here is an allusion to a notion of the Jews, that it was necessary, that ten at least should concur in social prayer, if an extraordinary success was expected. I am in the midst of them, Matthew 18:20 means, "by my special favour and presence: for, observing that in those religious assemblies they act as the duty which they owe to me directs, I will intercede with my Father for them, and procure them from him a gracious answer to their prayers." The Hebrew doctors have a saying, that "where two persons sit together conversing about the law, there the Shechinah is among them." Dr. Clarke paraphrases the 20th verse thus: "In whatever place the true doctrine of Christ is professed and practised, whether by many or few, there is the true church of Christ." See Sermon 18 vol. 10. Wetstein, and Tillotson's Works, vol. 3: p. 307.
Related Commentaries of Matthew 18:19
Matthew 18:19-20
19 Again 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.
20 For where two or three are gathered together in my name, there am I in the midst of them.