Jude 1:4

For certain men have crept in, who long ago were written down to this judgment, ungodly, transforming the grace of God into impurity, even denying Jesus Christ, our only Sovereign and Lord.

Galatians 2:4

but on account of the false brethren having crept in, who came in to spy out our liberty which we have in Christ Jesus, in order that they shall bring us into bondage:

1 Peter 2:8

who stumble over the word, disbelieving: unto which they indeed were appointed.

1 John 2:22

Who is a liar except the one denying that Jesus is the Christ? This one is the antichrist, the one denying the Father and the Son.

2 Timothy 3:6

For of these are those creeping into houses, and leading captive little, silly women laden with sins, being led by divers lusts,

Matthew 13:25

And while the men slept, an enemy came, and sowed tares in the midst of the wheat, and departed.

John 17:3

But this is eternal life, that they know thee the only true God, and Jesus Christ whom thou didst send.

Acts 11:23

Who, coming, and seeing the grace of God, rejoiced, and continued to exhort all, with purpose of heart to abide with the Lord:

Acts 15:24

Since we heard that certain ones having come out from us troubled you, disturbing your souls with words which we did not command:

Romans 6:1-2

Then what shall we say? must we abide in sin, in order that grace may abound?

Romans 9:21-22

Has not the potter the right of the clay, from the same lump to make one part a vessel unto honor, and another unto dishonor?

Galatians 5:13

For you were called unto liberty, brethren; only use not the liberty unto an occasion to the flesh, but through divine love serve one another.

Ephesians 4:14

in order that we may be no longer infants, tossed by the waves and carried about by every wind of teaching, in the caprice of the people, in their craftiness, pursuant to their method of delusion;

1 Timothy 6:15-16

which the blessed and only Sovereign, the King of the kings, and Lord of the lords, will manifest in his own due times;

Titus 1:15-16

To the pure all things are pure: but to the corrupted and unbelieving there is nothing pure; yea, their mind and their conscience are polluted.

Titus 2:11-12

For the grace of God, that brings salvation to all men, has appeared,

Hebrews 12:15-16

looking diligently lest any one may fail from the grace of God; lest any root of bitterness springing up may trouble you, and through it many may be defiled;

1 Peter 2:16

as free, and not as having the freedom as a cover of evil, but as servants of God.

1 Peter 4:18

And if the righteous is scarcely saved, where shall the ungodly and the sinner appear?

2 Peter 2:1-3

However there were indeed false prophets among the people, as there will also be false teachers among you, whosoever shall bring in destructive heresies, even denying the Lord who bought them, bringing on themselves swift destruction.

2 Peter 2:5-6

and spared not the old world, but delivered Noah the eighth person, the preacher of righteousness, brings the flood upon the world of the ungodly;

2 Peter 2:10

and especially those going after the flesh in the lust of pollution, and despising lordship. Audacious darers, blaspheming, they do not tremble at glories;

2 Peter 2:18-22

For speaking swelling words of vanity, in the lusts of the flesh they beguile with their impurities, those that have but partially escaped, who are still moving about in their delusion;

2 Peter 3:7

but now the heavens and the earth have been kept according to the same word, being reserved for fire in the day of judgment and the destruction of the ungodly people.

Jude 1:15

to execute judgment against all, and to convict all the ungodly of them for all the works of their ungodliness which they have impiously done, and for all their hard speeches which they have spoken against him, being ungodly sinners.

Revelation 15:4

Who may not fear, O Lord, and will not glorify thy name? because thou alone art holy; because all the nations shall come and worship before thee; because thy righteous acts 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
And while the men slept, an enemy came, and sowed tares in the midst of the wheat, and departed.
Acts 15:24
Since we heard that certain ones having come out from us troubled you, disturbing your souls with words which we did not command:
Galatians 2:4
but on account of the false brethren having crept in, who came in to spy out our liberty which we have in Christ Jesus, in order that they shall bring us into bondage:
Ephesians 4:14
in order that we may be no longer infants, tossed by the waves and carried about by every wind of teaching, in the caprice of the people, in their craftiness, pursuant to their method of delusion;
2 Timothy 3:6
For of these are those creeping into houses, and leading captive little, silly women laden with sins, being led by divers lusts,
2 Peter 2:1
However there were indeed false prophets among the people, as there will also be false teachers among you, whosoever shall bring in destructive heresies, even denying the Lord who bought them, bringing on themselves swift destruction.

Who

Romans 9:21
Has not the potter the right of the clay, from the same lump to make one part a vessel unto honor, and another unto dishonor?
1 Peter 2:8
who stumble over the word, disbelieving: unto which they indeed were appointed.
2 Peter 2:3
and in their covetousness they will sell you with their soft speeches: unto whom judgment from olden time tarries not, and their destruction does not slumber.

Turning

Romans 6:1
Then what shall we say? must we abide in sin, in order that grace may abound?
Galatians 5:13
For you were called unto liberty, brethren; only use not the liberty unto an occasion to the flesh, but through divine love serve one another.
Titus 2:11
For the grace of God, that brings salvation to all men, has appeared,
Hebrews 12:15
looking diligently lest any one may fail from the grace of God; lest any root of bitterness springing up may trouble you, and through it many may be defiled;
1 Peter 2:16
as free, and not as having the freedom as a cover of evil, but as servants of God.
2 Peter 2:10
and especially those going after the flesh in the lust of pollution, and despising lordship. Audacious darers, blaspheming, they do not tremble at glories;

Denying

Titus 1:15
To the pure all things are pure: but to the corrupted and unbelieving there is nothing pure; yea, their mind and their conscience are polluted.
2 Peter 2:1
However there were indeed false prophets among the people, as there will also be false teachers among you, whosoever shall bring in destructive heresies, even denying the Lord who bought them, bringing on themselves swift destruction.
1 John 2:22
Who is a liar except the one denying that Jesus is the Christ? This one is the antichrist, the one denying the Father and the Son.

General references

Matthew 24:11
And many false prophets will arise and deceive many.
1 Timothy 5:15
for already certain ones have turned away after Satan.
James 2:19
Do you believe that there is one God? you do well: the demons also believe and tremble.