1 John 1:8

If we claim to be already free from sin, we lead ourselves astray and the truth has no place in our hearts.

James 3:2

For we often stumble and fall, all of us. If there is any one who never stumbles in speech, that man has reached maturity of character and is able to curb his whole nature.

1 John 2:4

He who professes to know Him, and yet does not obey His commands, is a liar, and the truth has no place in his heart.

Romans 3:23

for all alike have sinned, and all consciously come short of the glory of God,

1 Corinthians 3:18

Let no one deceive himself. If any man imagines that he is wise, compared with the rest of you, with the wisdom of the present age, let him become "foolish" so that he may be wise.

Galatians 6:3

For if there is any one who thinks himself to be somebody when he is nobody, he is deluding himself.

1 Timothy 6:5

and persistent wranglings on the part of people whose intellects are disordered and they themselves blinded to all knowledge of the truth; who imagine that godliness means gain.

2 Timothy 3:13

But bad men and impostors will go on from bad to worse, misleading and being misled.

James 1:22

But prove yourselves obedient to the Message, and do not be mere hearers of it, imposing a delusion upon yourselves.

James 1:26

If a man thinks that he is scrupulously religious, although he is not curbing his tongue but is deceiving himself, his religious service is worthless.

2 Peter 2:13

being doomed to receive a requital for their guilt. They reckon it pleasure to feast daintily in broad daylight. They are spots and blemishes, while feeding luxuriously at their love-feasts, and banqueting with you.

1 John 1:6

If, while we are living in darkness, we profess to have fellowship with Him, we speak falsely and are not adhering to the truth.

1 John 1:10

If we deny that we have sinned, we make Him a liar, and His Message has no place in our hearts.

1 John 3:5-6

And you know that He appeared in order to take away sins; and in Him there is no sin.

2 John 1:2

for the sake of the truth which is continually in our hearts and will be with us for ever.

3 John 1:3

For it is an intense joy to me when brethren come and bear witness to your fidelity to the truth--that you live in obedience to the truth.

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, while we are living in darkness, we profess to have fellowship with Him, we speak falsely and are not adhering to the truth.
1 John 3:5
And you know that He appeared in order to take away sins; and in Him there is no sin.
Romans 3:23
for all alike have sinned, and all consciously come short of the glory of God,
James 3:2
For we often stumble and fall, all of us. If there is any one who never stumbles in speech, that man has reached maturity of character and is able to curb his whole nature.

We deceive

1 Corinthians 3:18
Let no one deceive himself. If any man imagines that he is wise, compared with the rest of you, with the wisdom of the present age, let him become "foolish" so that he may be wise.
Galatians 6:3
For if there is any one who thinks himself to be somebody when he is nobody, he is deluding himself.
2 Timothy 3:13
But bad men and impostors will go on from bad to worse, misleading and being misled.
James 1:22
But prove yourselves obedient to the Message, and do not be mere hearers of it, imposing a delusion upon yourselves.
2 Peter 2:13
being doomed to receive a requital for their guilt. They reckon it pleasure to feast daintily in broad daylight. They are spots and blemishes, while feeding luxuriously at their love-feasts, and banqueting with you.

General references

Hebrews 8:12
Because I will be merciful to their wrongdoings, and their sins I will remember no longer.'"