Matthew Poole and continuators on James 5:9

9 Grudg not one against another , brethren, lest ye be condemned , behold the judg standeth before the door .

Gr. Groan not; the sense may be, either, envy not one another, (or as we translate it, grudg not) it being the nature of Envy to groan at other Men's good; or, groan not by way of accusation or complaint to God against others; desiring him to avenge your quarrels, as if you were too good to suffer injuries; or God were unjust or forgetful of righting you.

Brother against Brother, Christian against Christian; they were injured not only by rich Worldlings, and open Oppressors, but by their fellow-Professors, and gave one another mutual cause of sighing and groaning.

Lest God punish you all; there being none of you but have given others cause of grief and complaint, as well as others have given you, Matth. 7.1.

The Lord Jesus Christ, the Judge of you all, is at hand (Phil. 4.5.) in a readiness either to bring those evils upon you, which you wish may fall upon others; or to give you your reward, if through patient continuance in well doing, you seek for it, Rom. 2.7. The like Phrase we have▪ Matth. 24.33. Mark 13.29. or it may allude to Gen. 4.7.

Marginal references: Or, groan, or grieve.