New Revised Standard Version
For if God did not spare the angels when they sinned, but cast them into hell and committed them to chains of deepest darkness to be kept until the judgment;

Contemporary English Version
God did not have pity on the angels that sinned. He had them tied up and thrown into the dark pits of hell until the time of judgment.

New American Bible
For if God did not spare the angels when they sinned, but condemned them to the chains of Tartarus and handed them over to be kept for judgment;

Douay-Rheims Bible
For if God spared not the angels that sinned, but delivered them, drawn down by infernal ropes to the lower hell, unto torments, to be reserved unto judgment:

For if God spared not the angels that sinned, but delivered them, drawn down by infernal ropes to the lower hell, unto torments, to be reserved unto judgment:

spared.

2 Peter 2:5 And spared not the original world, but preserved Noe, the eighth person, the preacher of justice, bringing in the flood upon the world of the ungodly.

Deuteronomy 29:20 And the Lord should not forgive him: but his wrath and jealousy against that man should be exceedingly enkindled at that time, and all the curses that are written in this volume should light upon him: and the Lord should blot out his name from under heaven,

Psalm 78:50 He made a way for a path to his anger: he spared not their souls from death, and their cattle he shut up in death.

Ezekiel 5:11 Therefore as I live, saith the Lord God: Because thou hast violated my sanctuary with all thy offences, and with all thy abominations: I will also break thee in pieces, and my eye shall not spare, and I will not have any pity.

Ezekiel 7:4,9 And my eye shall not spare thee, and I will shew thee no pity: but I will lay thy ways upon thee, and thy abominations shall be in the midst of thee: and you shall know that I am the Lord. . . .

Romans 8:32 He that spared not even his own Son, but delivered him up for us all, how hath he not also, with him, given us all things?

Romans 11:21 For if God hath not spared the natural branches, fear lest perhaps also he spare not thee.

the angels.

Job 4:18 Behold, they that serve him are not steadfast, and in his angels he found wickedness:

Luke 10:18 And he said to them: I saw Satan like lightning falling from heaven.

John 8:44 You are of your father the devil: and the desires of your father you will do. He was a murderer from the beginning: and he stood not in the truth, because truth is not in him. When he speaketh a lie, he speaketh of his own: for he is a liar, and the father thereof.

1 John 3:8 He that committeth sin is of the devil: for the devil sinneth from the beginning. For this purpose the Son of God appeared, that he might destroy the works of the devil.

Jude 1:6 And the angels who kept not their principality but forsook their own habitation, he hath reserved under darkness in everlasting chains, unto the judgment of the great day.

but.

Isaiah 14:12 How art thou fallen from heaven, O Lucifer, who didst rise in the morning? how art thou fallen to the earth, that didst wound the nations?

Matthew 8:29 And behold they cried out, saying: What have we to do with thee, Jesus Son of God? art thou come hither to torment us before the time?

Matthew 25:41 Then he shall say to them also that shall be on his left hand: Depart from me, you cursed, into everlasting fire, which was prepared for the devil and his angels.

Mark 5:7 And crying with a loud voice, he said: What have I to do with thee, Jesus the Son of the most high God? I adjure thee by God that thou torment me not.

Luke 8:31 And they besought him that he would not command them to go into the abyss.

Revelation 12:7-9 And there was a great battle in heaven: Michael and his angels fought with the dragon, and the dragon fought, and his angels. . . .

Revelation 20:2,3,10 And he laid hold on the dragon, the old serpent, which is the devil and Satan, and bound him for a thousand years. . . .

into.

2 Peter 2:11 Whereas angels, who are greater in strength and power, bring not against themselves a railing judgment.

Jude 1:6 And the angels who kept not their principality but forsook their own habitation, he hath reserved under darkness in everlasting chains, unto the judgment of the great day.

to be.

2 Peter 2:9 The Lord knoweth how to deliver the godly from temptation, but to reserve the unjust unto the day of judgment to be tormented:

Job 21:30 Because the wicked man is reserved to the day of destruction, and he shall be brought to the day of wrath.

Jude 1:13 Raging waves of the sea, foaming out their own confusion: wandering stars, to whom the storm of darkness is reserved for ever.