³ Be on your guard! If your brother sins, rebuke him; and if he repents, forgive him. ⁴ And if he wrongs you seven times in one day and returns to you seven times saying, ‘I am sorry,’ you should forgive him.” (Luke 17)

The disciples are warned to be on guard lest they become like the Pharisees. Several translations take the term adelphos as “disciple” but our translation does well to let it be literal as “brothers” [and sisters], retaining the communal kinship brought about by their common faith and service. Jesus is stressing that even individual sin has a communal element in that the sin of one may lead others astray. This sense of community is made clear in the Matthean parallel:

¹⁵ “If your brother sins (against you), go and tell him his fault between you and him alone. If he listens to you, you have won over your brother. ¹⁶ If he does not listen, take one or two others along with you, so that ‘every fact may be established on the testimony of two or three witnesses.’ ¹⁷ If he refuses to listen to them, tell the church.  If he refuses to listen even to the church, then treat him as you would a Gentile or a tax collector” (Mt 18:15–17).