Matthäus 18:20

For where two or three are gathered together in my name--or "unto my name." there am I in the midst of them--On this passage--so full of sublime encouragement to Christian union in action and prayer--observe, first, the connection in which it stands. Our Lord had been speaking of church meetings before which the obstinate perversity of a brother was in the last resort to be brought, and whose decision was to be final--such honor does the Lord of the Church put upon its lawful assemblies. But not these assemblies only does He deign to countenance and honor. For even two uniting to bring any matter before Him shall find that they are not alone, for My Father is with them, says Jesus. Next, observe the premium here put upon union in prayer. As this cannot exist with fewer than two, so by letting it down so low as that number, He gives the utmost conceivable encouragement to union in this exercise. But what kind of union? Not an agreement merely to pray in concert, but to pray for some definite thing. "As touching anything which they shall ask," says our Lord--anything they shall agree to ask in concert. At the same time, it is plain He had certain things at that moment in His eye, as most fitting and needful subjects for such concerted prayer. The Twelve had been "falling out by the way" about the miserable question of precedence in their Master's kingdom, and this, as it stirred their corruptions, had given rise--or at least was in danger of giving rise--to "offenses" perilous to their souls. The Lord Himself had been directing them how to deal with one another about such matters. "But now shows He unto them a more excellent way." Let them bring all such matters--yea, and everything whatsoever by which either their own loving relationship to each other, or the good of His…

The gospels are, in short, a record of what Jesus began both to do and to teach. In the foregoing chapter, we had an account of his doings, in this, of his teachings; probably, not all at the same time, in a continued discourse, but at several times, upon divers occasions, here put together, as near akin. We have here, I. Instructions concerning humility (Mat 18:1-6). II. Concerning offences in general (Mat 18:7), particularly offences given, 1. By us to ourselves (Mat 18:8, Mat 18:9). 2. By us to others, (Mat 18:10-14). 3. By others to us; which are of two sorts, (1.) Scandalous sins, which are to be reproved (Mat 18:15-20). (2.) Personal wrongs, which are to be forgiven (Mat 18:21-35). See how practical Christ's preaching was; he could have revealed mysteries, but he pressed plain duties, especially those that are most displeasing to flesh and blood.

18:20 Christ is present in the process of discipline, so the process is a ratification of God’s decision.