Moreover if thy brother shall trespass. — Better, and if thy brother shall sin. A twofold train of thought is traceable in what follows. (1.) The presence of “offences” implies sin, and the question arises how each man is to deal with those sins which affect himself personally. (2.) The dispute in which the teaching recorded in this chapter had originated implied that the unity of the society which was then represented by the Twelve, had for the time been broken. Each of the disciples thought himself, in some sense, aggrieved by others. Sharp words, it may be, had been spoken among them, and the breach had to be healed.
Go and tell him his fault. — The Greek is somewhat stronger, convict him of his fault, press it home on him in such a way as to reach his reason and his conscience. (Comp. John 16:8.) But this is to be done “between thee and him alone.” Angry words spoken in the presence of others would fail of that result. It is significant that the substance of the precept is taken from the passage in Leviticus (Leviticus 19:17-18) which ends with “Thou shalt love thy neighbour as thyself.”
Thou hast gained thy brother. — The words in part derive their force from the subtle use of a word in one sense which men associated commonly with another. “Gain” of some kind, aimed at, or wrongfully withheld, was commonly the origin of disputes and litigation. A man hoped to reap some profit by going to law. In the more excellent way which our Lord points out, he would by sacrificing the lower gain, attain the higher, and win for God (see 1 Corinthians 9:19; 1 Peter 3:1, for this aspect of the word) and for himself the brother with whom he had been at variance.