Two or Three Gather

The context of “where two or three are gathered together in my name” has to do with church discipline and the confrontation of the wayward sinner. In verse 16, the principle has been invoked of needing “two or three witnesses” in making an accusation. It seems that the mention of “two or three” in verse 20 echoes that principle; the “two or three” are confronting sin in the church.