4:1-8 To abide in the faith of the gospel is not enough, we must abound in the work of faith. The rule according to which all ought to walk and act, is the commandments given by the Lord Jesus Christ. Sanctification, in the renewal of their souls under the influences of the Holy Spirit, and attention to appointed duties, constituted the will of God respecting them. In aspiring after this renewal of the soul unto holiness, strict restraint must be put upon the appetites and senses of the body, and on the thoughts and inclinations of the will, which lead to wrong uses of them. The Lord calls none into his family to live unholy lives, but that they may be taught and enabled to walk before him in holiness. Some make light of the precepts of holiness, because they hear them from men; but they are God's commands, and to break them is to despise God.
6. go beyond—transgress the bounds of rectitude in respect to his "brother."
defraud—"overreach" [Alford]; "take advantage of" [Edmunds].
in any matter—rather as Greek, "in the matter"; a decorous expression for the matter now in question; the conjugal honor of his neighbor as a husband, 1Th 4:4; 1Th 4:7 also confirms this view; the word "brother" enhances the enormity of the crime. It is your brother whom you wrong (compare Pr 6:27-33).
the Lord—the coming Judge (2Th 1:7, 8).
of all such—Greek, "concerning all these things;" in all such cases of wrongs against a neighbor's conjugal honor.
testified—Greek, "constantly testified [Alford].