Commentaries:
Robertson's Word Pictures (NT)
Will eat (nomhn ecei). "Will have (future active of exw) pasturage or increase" (nomh, old word from nemw, to pasture, in N.T. only here and John 10:9).
As doth gangrene (wv gaggraina). Late word (medical writers and Plutarch), only here in N.T. From graw or grainw, to gnaw, to eat, an eating, spreading disease. Hymenaeus is probably the one mentioned in I Timothy 1:20. Nothing is known of Philetus.
Other Robertson's Word Pictures (NT) entries containing 2 Timothy 2:17:
John 10:9
1 Timothy 1:20
2 Peter 3:16
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