[RCL]: Exodus 12:1-14; Psalm 149; Romans 13:8-14; Matthew 18:15-20 Today’s Gospel reading merits a bit of investigation—it needs to be mined to find the gold.                                                                First of all, some notes about the text.  This passage appears only in Matthew—and it’s only in Matthew that we hear Jesus use the word “church”—so it probably holds a bit…