Jakobus 5:3

is cankered--"rusted through" [ALFORD]. rust . . . witness against you--in the day of judgment; namely, that your riches were of no profit to any, lying unemployed and so contracting rust. shall eat your flesh--The rust which once ate your riches, shall then gnaw your conscience, accompanied with punishment which shall prey upon your bodies for ever. as . . . fire--not with the slow process of rusting, but with the swiftness of consuming fire. for the last days--Ye have heaped together, not treasures as ye suppose (compare Luk 12:19), but wrath against the last days, namely, the coming judgment of the Lord. ALFORD translates more literally, "In these last days (before the coming judgment) ye laid up (worldly) treasure" to no profit, instead of repenting and seeking salvation (see on Jam 5:5).

In this chapter the apostle denounces the judgments of God upon those rich men who oppress the poor, showing them how great their sin and folly are in the sight of God, and how grievous the punishments would be which should fall upon themselves (Jam 5:1-6). Hereupon, all the faithful are exhorted to patience under their trials and sufferings (Jam 5:7-11). The sin of swearing is cautioned against (Jam 5:12). We are directed how to act, both under affliction and in prosperity (Jam 5:13). Prayer for the sick, and anointing with oil, are prescribed (Jam 5:14, Jam 5:15). Christians are directed to acknowledge their faults one to another, and to pray one for another, and the efficacy of prayer is proved (Jam 5:16-18). And, lastly, it is recommended to us to do what we can for bringing back those that stray from the ways of truth.

5:3 Material wealth, represented by gold and silver, is worthless in the face of God’s judgment. In fact, it will testify against them because it was unjustly gotten (5:4) and wickedly used (5:5-6).