1 John 1:8

If we claim "We are already free from sin," we are deceiving ourselves and the truth is not in our hearts.

James 3:2

For we all make many a slip. If anyone never slips in speech, he is a man of maturity; he can control his whole body too.

1 John 2:4

Whoever says, "I know Him," but does not practice obedience to His commands is a liar, and there is no truth in his heart;

Romans 3:23

For everybody has sinned and everybody continues to come short of God's glory,

1 Corinthians 3:18

Let no one deceive himself. If any one of you supposes that he is wise in this world's wisdom, as compared with the rest of you, to become really wise he must become a fool.

Galatians 6:3

For if anybody thinks he is somebody when really he is nobody, he deceives himself.

1 Timothy 6:5

and perpetual friction between people who are depraved in mind and deprived of truth, who imagine that religion is only a means of gain.

2 Timothy 3:13

But bad men and imposters will go on from bad to worse, misleading others and misled themselves.

James 1:22

Keep on obeying this message; do not merely listen to it, and so deceive yourselves.

James 1:26

If anyone thinks he is religious, and does not bridle his tongue, but deceives himself, his religious worship is worthless.

2 Peter 2:13

They think their daily luxurious living real pleasure; they are spots and blots, deceitfully living in luxurious pleasure while they continue their religious feasting with you.

1 John 1:6

If we say "We have fellowship with Him," and yet live in darkness, we are lying and not practicing the truth.

1 John 1:10

If we claim "We have not sinned," we are making Him a liar, and His message is not in our hearts.

1 John 3:5-6

You know that He appeared to take our sins away, and that there is no sin in Him.

2 John 1:2

because of the truth that lives on in our hearts and will be with us forever:

3 John 1:3

For I am happy to have some brothers come and testify to the truth that is in you, since you are living by 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 we say "We have fellowship with Him," and yet live in darkness, we are lying and not practicing the truth.
1 John 3:5
You know that He appeared to take our sins away, and that there is no sin in Him.
Romans 3:23
For everybody has sinned and everybody continues to come short of God's glory,
James 3:2
For we all make many a slip. If anyone never slips in speech, he is a man of maturity; he can control his whole body too.

We deceive

1 Corinthians 3:18
Let no one deceive himself. If any one of you supposes that he is wise in this world's wisdom, as compared with the rest of you, to become really wise he must become a fool.
Galatians 6:3
For if anybody thinks he is somebody when really he is nobody, he deceives himself.
2 Timothy 3:13
But bad men and imposters will go on from bad to worse, misleading others and misled themselves.
James 1:22
Keep on obeying this message; do not merely listen to it, and so deceive yourselves.
2 Peter 2:13
They think their daily luxurious living real pleasure; they are spots and blots, deceitfully living in luxurious pleasure while they continue their religious feasting with you.

General references

Hebrews 8:12
For I will be merciful to their deeds of wrong, and never, never any more will I recall their sins,'"