1 John 1:8

If we say, 'We are not guilty,' we are deceiving ourselves and the truth is not in us;

James 3:2

We all make many a slip, but whoever avoids slips of speech is a perfect man; he can bridle the whole of the body as well as the tongue.

1 John 2:4

He who says, 'I know him,' but does not obey his commands, is a liar and the truth is not in him;

Romans 3:23

All have sinned, all come short of the glory of God,

1 Corinthians 3:18

Let no one deceive himself about this; whoever of you imagines he is wise with this world's wisdom must become a 'fool,' if he is really to be wise.

Galatians 6:3

If anyone imagines he is somebody, he is deceiving himself, for he is nobody;

1 Timothy 6:5

and constant friction between people who are depraved in mind and deprived of the Truth. They imagine religion is a paying concern.

2 Timothy 3:13

Bad characters and impostors will go from bad to worse, deceiving others and deceived themselves;

James 1:22

Act on the Word, instead of merely listening to it and deluding yourselves.

James 1:26

Whoever considers he is religious, and does not bridle his tongue, but deceives his own heart, his religion is futile.

2 Peter 2:13

done out of the profits of their evil-doing. Pleasure for them is revelling in open daylight ??spots and blots, with their dissipated revelling, as they carouse in your midst! ??14 their eyes are full of harlotry, insatiable for sin; their own hearts trained to lust, they beguile unsteady souls. Accursed generation!

1 John 1:6

If we say, 'We have fellowship with him,' when we live and move in darkness, then we are lying, we are not practising the truth;

1 John 1:10

if we say, "We have not sinned," we make him a liar and his word is not within us.

1 John 3:5-6

and you know he appeared to take [our] sins away. In him there is no sin;

2 John 1:2

for the sake of the Truth which remains within us and will be with us for ever:

3 John 1:3

For I was overjoyed when some brothers arrived and testified to the truth of your life, as indeed you do lead the true Life;

Treasury of Scripture Knowledge

Summary

If we say that we have no sin, we deceive ourselves, and the truth is not in us.

General references

Bible References

Say

1 John 1:6
If we say, 'We have fellowship with him,' when we live and move in darkness, then we are lying, we are not practising the truth;
1 John 3:5
and you know he appeared to take [our] sins away. In him there is no sin;
Romans 3:23
All have sinned, all come short of the glory of God,
James 3:2
We all make many a slip, but whoever avoids slips of speech is a perfect man; he can bridle the whole of the body as well as the tongue.

We deceive

1 Corinthians 3:18
Let no one deceive himself about this; whoever of you imagines he is wise with this world's wisdom must become a 'fool,' if he is really to be wise.
Galatians 6:3
If anyone imagines he is somebody, he is deceiving himself, for he is nobody;
2 Timothy 3:13
Bad characters and impostors will go from bad to worse, deceiving others and deceived themselves;
James 1:22
Act on the Word, instead of merely listening to it and deluding yourselves.
2 Peter 2:13
done out of the profits of their evil-doing. Pleasure for them is revelling in open daylight ??spots and blots, with their dissipated revelling, as they carouse in your midst! ??14 their eyes are full of harlotry, insatiable for sin; their own hearts trained to lust, they beguile unsteady souls. Accursed generation!

General references

Hebrews 8:12
I will be merciful to their iniquities, and remember their sins no more.