Commentaries:
Robertson's Word Pictures (NT)
Woe to them (ouai autoiv). Interjection with the dative as is common in the Gospels (Matthew 11:21).
Went (eporeuqhsan). First aorist passive (deponent) indicative of poreuomai.
In the way of Cain (th odw tou Kain). Locative case odw. Cain is Jude's fourth example. Not in II Peter, but in Hebrews 11:4; I John 3:11 f. From Genesis 4:7.
Ran riotously (ecexuqhsan). First aorist passive indicative of ekxew, to pour out, "they were poured out," vigorous metaphor for excessive indulgence. But it is used also of God's love for us (Romans 5:5).
In the error of Balaam (th planh tou Balaam). The fifth example in Jude. In II Peter also (II Peter 2:15). Either locative case (in) or instrumental (by). Planh (in Peter also) is the common word for such wandering (Matthew 24:4 ff., etc.).
Perished (apwlonto). Second aorist middle (intransitive) of apollumi.
In the gainsaying of Korah (th antilogiai tou Kore). Again either locative or instrumental. The word antilogia is originally answering back (Hebrews 6:16), but it may be by act also (Romans 10:21) as here. This is the sixth example in Jude, not in II Peter.
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