Titus 1:16

God they profess to know, and in the works they deny Him, being abominable, and disobedient, and unto every good work disapproved.

1 John 2:4

he who is saying, 'I have known him,' and his command is not keeping, a liar he is, and in him the truth is not;

Isaiah 29:13

And the Lord saith: Because drawn near hath this people, with its mouth, And with its lips they have honoured Me, And its heart it hath put far off from Me, And their fear of Me is -- A precept of men is taught!

Ezekiel 33:31

And they come in unto thee as the coming in of a people, And they sit before thee -- My people, And have heard thy words, and they do them not, For doting loves with their mouth they are making, After their dishonest gain their heart is going.

1 Timothy 5:8

and if any one for his own -- and especially for those of the household -- doth not provide, the faith he hath denied, and than an unbeliever he is worse.

2 Timothy 3:5-8

having a form of piety, and its power having denied; and from these be turning away,

Jude 1:4

for there did come in unobserved certain men, long ago having been written beforehand to this judgment, impious, the grace of our God perverting to lasciviousness, and our only Master, God, and Lord -- Jesus Christ -- denying,

1 Samuel 15:22

And Samuel saith, 'Hath Jehovah had delight in burnt-offerings and sacrifices as in hearkening to the voice of Jehovah? lo, hearkening than sacrifice is better; to give attention than fat of rams;

Revelation 21:8

and to fearful, and unstedfast, and abominable, and murderers, and whoremongers, and sorcerers, and idolaters, and all the liars, their part is in the lake that is burning with fire and brimstone, which is a second death.'

Numbers 24:16

An affirmation of him who is hearing sayings of God -- And knowing knowledge of the Most High; A vision of the Almighty he seeth, Falling -- and eyes uncovered:

Isaiah 48:1

Hear ye this, O house of Jacob, Who are called by the name of Israel, And from the waters of Judah came out, Who are swearing by the name of Jehovah, And of the God of Israel make mention, Not in truth nor in righteousness.

Isaiah 58:2

Seeing -- Me day by day they seek, And the knowledge of My ways they desire, As a nation that righteousness hath done, And the judgment of its God hath not forsaken, They ask of me judgments of righteousness, The drawing near of God they desire:

Jeremiah 6:30

'Silver rejected,' they have called to them, For Jehovah hath kicked against them!

Hosea 8:2-3

To Me they cry, 'My God, we -- Israel -- have known Thee.'

Romans 1:28

And, according as they did not approve of having God in knowledge, God gave them up to a disapproved mind, to do the things not seemly;

Ephesians 5:6

Let no one deceive you with vain words, for because of these things cometh the anger of God upon the sons of the disobedience,

Revelation 21:27

and there may not at all enter into it any thing defiling and doing abomination, and a lie, but -- those written in the scroll of the life of the Lamb.

1 Timothy 1:9

having known this, that for a righteous man law is not set, but for lawless and insubordinate persons, ungodly and sinners, impious and profane, parricides and matricides, men-slayers,

1 Samuel 15:24

And Saul saith unto Samuel, 'I have sinned, for I passed over the command of Jehovah, and thy words; because I have feared the people, I also hearken to their voice;

Job 15:16

Also -- surely abominable and filthy Is man drinking as water perverseness.

Romans 2:18-24

and dost know the will, and dost approve the distinctions, being instructed out of the law,

Treasury of Scripture Knowledge

Summary

They profess that they know God; but in works they deny him, being abominable, and disobedient, and unto every good work reprobate.

Bible References

Profess

Numbers 24:16
An affirmation of him who is hearing sayings of God -- And knowing knowledge of the Most High; A vision of the Almighty he seeth, Falling -- and eyes uncovered:
Isaiah 29:13
And the Lord saith: Because drawn near hath this people, with its mouth, And with its lips they have honoured Me, And its heart it hath put far off from Me, And their fear of Me is -- A precept of men is taught!
Isaiah 48:1
Hear ye this, O house of Jacob, Who are called by the name of Israel, And from the waters of Judah came out, Who are swearing by the name of Jehovah, And of the God of Israel make mention, Not in truth nor in righteousness.
Isaiah 58:2
Seeing -- Me day by day they seek, And the knowledge of My ways they desire, As a nation that righteousness hath done, And the judgment of its God hath not forsaken, They ask of me judgments of righteousness, The drawing near of God they desire:
Ezekiel 33:31
And they come in unto thee as the coming in of a people, And they sit before thee -- My people, And have heard thy words, and they do them not, For doting loves with their mouth they are making, After their dishonest gain their heart is going.
Hosea 8:2
To Me they cry, 'My God, we -- Israel -- have known Thee.'
Romans 2:18
and dost know the will, and dost approve the distinctions, being instructed out of the law,
2 Timothy 3:5
having a form of piety, and its power having denied; and from these be turning away,
Jude 1:4
for there did come in unobserved certain men, long ago having been written beforehand to this judgment, impious, the grace of our God perverting to lasciviousness, and our only Master, God, and Lord -- Jesus Christ -- denying,

Being

Job 15:16
Also -- surely abominable and filthy Is man drinking as water perverseness.
Revelation 21:8
and to fearful, and unstedfast, and abominable, and murderers, and whoremongers, and sorcerers, and idolaters, and all the liars, their part is in the lake that is burning with fire and brimstone, which is a second death.'

And disobedient

1 Samuel 15:22
And Samuel saith, 'Hath Jehovah had delight in burnt-offerings and sacrifices as in hearkening to the voice of Jehovah? lo, hearkening than sacrifice is better; to give attention than fat of rams;
Ephesians 5:6
Let no one deceive you with vain words, for because of these things cometh the anger of God upon the sons of the disobedience,
1 Timothy 1:9
having known this, that for a righteous man law is not set, but for lawless and insubordinate persons, ungodly and sinners, impious and profane, parricides and matricides, men-slayers,

Unto

Jeremiah 6:30
'Silver rejected,' they have called to them, For Jehovah hath kicked against them!
Romans 1:28
And, according as they did not approve of having God in knowledge, God gave them up to a disapproved mind, to do the things not seemly;
2 Timothy 3:8
and, even as Jannes and Jambres stood against Moses, so also these do stand against the truth, men corrupted in mind, disapproved concerning the faith;

General references

Numbers 23:12
and he answereth and saith, 'That which Jehovah doth put in my mouth -- it do I not take heed to speak?'
Deuteronomy 14:7
Only, this ye do not eat, of those bringing up the cud, and of those dividing the cloven hoof: the camel, and the hare, and the rabbit, for they are bringing up the cud but the hoof have not divided; unclean they are to you;
Hosea 8:2
To Me they cry, 'My God, we -- Israel -- have known Thee.'