Matthew 18:20
For where two or three are gathered together in my name, there am I in the midst of them.
For a sinning brother you need 2 or 3 witnesses to corroborate the facts. This is in reference to Matthew 18:16. In this particular passage Jesus didn't say that He would be in the midst of them, only that the truth of the matter regarding the trespass of the brother in question. In my opinion these are two passages are speaking about two entirely different things.
Not sure I fully agree. The only reason I post what I did and think it means is because
18:19, 20 This passage specifically refers to church discipline. It is a promise for guidance for the two or three who confront, and a promise for the church to claim wisdom and restoration for the erring brother. (NKJV study bible notes)
v. 16 is not as clear. The principle of witnesses is taken from Deut. 19:15, but what is it the witnesses attest? Evidently they witness that the offended brother is acting in good faith and the right spirit in attempting to work out a reconciliation. They also would be witnesses to any agreement. If this does not bring peace, the offended brother is to report it to the assembly. The church then is to do everything possible to convince the believer who has sinned to be reconciled or to right the wrong. If the erring one will not respond, that person is to be disciplined by being cut off from the fellowship. Such a loss would be extremely(NKJV study bible notes)
“It is with this in mind that Jesus said the Father would grant the request of two or more who gather together in Christ’s name and are in agreement. Agreement on what? On disciplining the erring brother. That’s what this passage is about and yet so many Christians use it as though Jesus promises to answer their prayers when offered in certain situations.”
This doesn’t mean that Jesus doesn’t hear our prayers when we pray alone or with two or three people etc. …He does. But it means that this particular verse is not talking about Jesus’ presence in prayer, it’s talking about His presence in church discipline. (Tim Chaffey)