Footnotes:

1. 18:20 For where two or three…midst of them: the presence of Jesus guarantees the efficacy of the prayer. This saying is similar to one attributed to a rabbi executed in A.D. 135 at the time of the second Jewish revolt: “…When two sit and there are between them the words of the Torah, the divine presence (Shekinah) rests upon them” (Pirqê ’Abôt 3, 3).
2. 18:21–35 The final section of the discourse deals with the forgiveness that the disciples are to give to their fellow disciples who sin against them. To the question of Peter how often forgiveness is to be granted (Mt 18:21), Jesus answers that it is to be given without limit (Mt 18:22) and illustrates this with the parable of the unmerciful servant (Mt 18:23–34), warning that his heavenly Father will give those who do not forgive the same treatment as that given to the unmerciful servant (Mt 18:35). Mt 18:21–22 correspond to Lk 17:4; the parable and the final warning are peculiar to Matthew. That the parable did not originally belong to this context is suggested by the fact that it really does not deal with repeated forgiveness, which is the point of Peter’s question and Jesus’ reply.