2 Peter 2:4

“For if God spared not the angels that sinned. etc.] By whom are meant the devil and his angels; who are spirits created by God and as such were good; their first estate which they left was pure and holy, as well as high and honourable; they, were at first in the truth, though they abode not in it; they were once among the morning stars and sons of God, and were angels of light; their numbers are many, and therefore are here expressed in the plural number, “angels”, though it cannot be said how large; a legion of them was in one man; one at first might be in the rebellion, and draw a large number with him into it, at least was at the head of it, who is called Beelzebub, the prince of devils:…”

“if--The apodosis or consequent member of the sentence is not expressed, but is virtually contained in Pe2 2:9. If God in past time has punished the ungodly and saved His people, He will be sure to do so also in our days (compare end of Pe2 2:3). angels--the highest of intelligent creatures (compare with this verse, Jde 1:6), yet not spared when they sinned. hell--Greek, "Tartarus": nowhere else in New Testament or the Septuagint: equivalent to the usual Greek, "Gehenna." Not inconsistent with Pe1 5:8; for though their final doom is hell, yet for a time they are permitted to roam beyond it in "the darkness of this world." Slaves of Tartarus (called "the abyss," or "deep," Luk 8:31; "the…”

“For if God spared not the angels that sinned - The apostle now proceeds to the proof of the proposition that these persons would be punished. It is to be remembered that they had been, or were even then, professing Christians, though they had really, if not in form, apostatized from the faith 2 Peter 2:20-22, and a part of the proofs, therefore, are derived from the cases of those who had apostatized from the service of God. He appeals, therefore, to the case of the angels that had revolted. Neither their former rank, their dignity, nor their holiness, saved them from being thrust down to hell; and if God punished them so severely, then false teachers could not hope to escape. The apostle,…”

“Cast them down to hell - The bottomless pit, a place of unknown misery. Delivered them - Like condemned criminals to safe custody, as if bound with the strongest chains in a dungeon of darkness, to be reserved unto the judgment of the great day. Though still those chains do not hinder their often walking up and down seeking whom they may devour. 2 Peter 2:5”

“2:4-10 Three Old Testament examples of judgment show that God will vindicate those who remain faithful to him and will condemn those who deny him, including the false teachers (see 2:3). 2:4 The first example of judgment is the angels who sinned: The widespread Jewish tradition was that “the sons of God” in Gen 6:1-5 (understood as angels) had intercourse with women and were therefore judged by God at that time (see 1 Enoch 6–10; cp. 1 Pet 3:19-20; Jude 1:6). • in gloomy pits of darkness: This description of the underworld was popular in the ancient world and is probably metaphorical.”

“spared: Pe2 2:5; Deu 29:20; Psa 78:50; Eze 5:11, Eze 7:4, Eze 7:9; Rom 8:32, Rom 11:21 the angels: Job 4:18; Luk 10:18; Joh 8:44; Jo1 3:8; Jde 1:6 but: Isa 14:12; Mat 8:29, Mat 25:41; Mar 5:7; Luk 8:31; Rev 12:7-9, Rev 20:2, Rev 20:3, Rev 20:10 into: Pe2 2:11; Jde 1:6 to be: Pe2 2:9; Job 21:30; Jde 1:13 2 Peter 2:5”