Jude 1:4

For certain men have got in unnoticed, they who of old were marked out beforehand to this sentence, ungodly persons, turning the grace of our God into dissoluteness, and denying our only Master and Lord Jesus Christ.

Galatians 2:4

and it was on account of the false brethren brought in surreptitiously, who came in surreptitiously to spy out our liberty which we have in Christ Jesus, that they might bring us into bondage;

1 Peter 2:8

and a stone of stumbling and rock of offence; who stumble at the word, being disobedient to which also they have been appointed.

1 John 2:22

Who is the liar but he who denies that Jesus is the Christ? He is the antichrist who denies the Father and the Son.

2 Timothy 3:6

For of these are they who are getting into houses, and leading captive silly women, laden with sins, led by various lusts,

2 Samuel 22:5

For the waves of death encompassed me, Torrents of Belial made me afraid.

Psalm 1:1

Blessed is the man that walketh not in the counsel of the wicked, and standeth not in the way of sinners, and sitteth not in the seat of scorners;

Psalm 62:2

He only is my rock and my salvation; my high fortress: I shall not be greatly moved.

Matthew 13:25

but while men slept, his enemy came and sowed darnel amongst the wheat, and went away.

John 17:3

And this is the eternal life, that they should know thee, the only true God, and Jesus Christ whom thou hast sent.

Acts 11:23

who, having arrived and seeing the grace of God, rejoiced, and exhorted all with purpose of heart to abide with the Lord;

Acts 15:24

Inasmuch as we have heard that some who went out from amongst us have troubled you by words, upsetting your souls, saying that ye must be circumcised and keep the law; to whom we gave no commandment;

Romans 6:1-2

What then shall we say? Should we continue in sin that grace may abound?

Romans 9:21-22

Or has not the potter authority over the clay, out of the same lump to make one vessel to honour, and another to dishonour?

Galatians 5:13

For ye have been called to liberty, brethren; only do not turn liberty into an opportunity to the flesh, but by love serve one another.

Ephesians 4:14

in order that we may be no longer babes, tossed and carried about by every wind of that teaching which is in the sleight of men, in unprincipled cunning with a view to systematized error;

1 Timothy 6:15-16

which in its own time the blessed and only Ruler shall shew, the King of those that reign, and Lord of those that exercise lordship;

Titus 1:15-16

All things are pure to the pure; but to the defiled and unbelieving nothing is pure; but both their mind and their conscience are defiled.

Titus 2:11-12

For the grace of God which carries with it salvation for all men has appeared,

Hebrews 12:15-16

watching lest there be any one who lacks the grace of God; lest any root of bitterness springing up trouble you, and many be defiled by it;

1 Peter 2:16

as free, and not as having liberty as a cloak of malice, but as God's bondmen.

1 Peter 4:18

And if the righteous is difficultly saved, where shall the impious and the sinner appear?

2 Peter 2:1-3

But there were false prophets also among the people, as there shall be also among you false teachers, who shall bring in by the bye destructive heresies, and deny the master that bought them, bringing upon themselves swift destruction;

2 Peter 2:5-6

and spared not the old world, but preserved Noe, the eighth, a preacher of righteousness, having brought in the flood upon the world of the ungodly;

2 Peter 2:10

and specially those who walk after the flesh in the lust of uncleanness, and despise lordship. Bold are they, self-willed; they do not fear speaking injuriously of dignities:

2 Peter 2:18-22

For while speaking great highflown words of vanity, they allure with the lusts of the flesh, by dissoluteness, those who have just fled those who walk in error,

2 Peter 3:7

But the present heavens and the earth by his word are laid up in store, kept for fire unto a day of judgment and destruction of ungodly men.

Jude 1:15

to execute judgment against all; and to convict all the ungodly of them of all their works of ungodliness, which they have wrought ungodlily, and of all the hard things which ungodly sinners have spoken against him.

Revelation 15:4

Who shall not fear thee, O Lord, and glorify thy name? for thou only art holy; for all nations shall come and do homage before thee; for thy righteousnesses have been made manifest.

Treasury of Scripture Knowledge

Summary

For there are certain men crept in unawares, who were before of old ordained to this condemnation, ungodly men, turning the grace of our God into lasciviousness, and denying the only Lord God, and our Lord Jesus Christ.

Bible References

Crept

Matthew 13:25
but while men slept, his enemy came and sowed darnel amongst the wheat, and went away.
Acts 15:24
Inasmuch as we have heard that some who went out from amongst us have troubled you by words, upsetting your souls, saying that ye must be circumcised and keep the law; to whom we gave no commandment;
Galatians 2:4
and it was on account of the false brethren brought in surreptitiously, who came in surreptitiously to spy out our liberty which we have in Christ Jesus, that they might bring us into bondage;
Ephesians 4:14
in order that we may be no longer babes, tossed and carried about by every wind of that teaching which is in the sleight of men, in unprincipled cunning with a view to systematized error;
2 Timothy 3:6
For of these are they who are getting into houses, and leading captive silly women, laden with sins, led by various lusts,
2 Peter 2:1
But there were false prophets also among the people, as there shall be also among you false teachers, who shall bring in by the bye destructive heresies, and deny the master that bought them, bringing upon themselves swift destruction;

Who

Romans 9:21
Or has not the potter authority over the clay, out of the same lump to make one vessel to honour, and another to dishonour?
1 Peter 2:8
and a stone of stumbling and rock of offence; who stumble at the word, being disobedient to which also they have been appointed.
2 Peter 2:3
And through covetousness, with well-turned words, will they make merchandise of you: for whom judgment of old is not idle, and their destruction slumbers not.

Turning

Romans 6:1
What then shall we say? Should we continue in sin that grace may abound?
Galatians 5:13
For ye have been called to liberty, brethren; only do not turn liberty into an opportunity to the flesh, but by love serve one another.
Titus 2:11
For the grace of God which carries with it salvation for all men has appeared,
Hebrews 12:15
watching lest there be any one who lacks the grace of God; lest any root of bitterness springing up trouble you, and many be defiled by it;
1 Peter 2:16
as free, and not as having liberty as a cloak of malice, but as God's bondmen.
2 Peter 2:10
and specially those who walk after the flesh in the lust of uncleanness, and despise lordship. Bold are they, self-willed; they do not fear speaking injuriously of dignities:

Denying

Titus 1:15
All things are pure to the pure; but to the defiled and unbelieving nothing is pure; but both their mind and their conscience are defiled.
2 Peter 2:1
But there were false prophets also among the people, as there shall be also among you false teachers, who shall bring in by the bye destructive heresies, and deny the master that bought them, bringing upon themselves swift destruction;
1 John 2:22
Who is the liar but he who denies that Jesus is the Christ? He is the antichrist who denies the Father and the Son.

General references

Leviticus 15:8
And if he that hath the flux spit upon him that is clean, then he shall wash his garments, and bathe in water, and be unclean until the even.
Matthew 24:11
and many false prophets shall arise and shall mislead many;
1 Timothy 5:15
For already some have turned aside after Satan.
James 2:19
Thou believest that God is one. Thou doest well. The demons even believe, and tremble.