1 John 1:6

If we say that we have communion with Him, and walk in darkness, we lie and do not practise the truth:

1 John 4:20

I love God, and hateth his brother, he is a liar: for how can he, that loveth not his brother, whom he hath seen, love God whom he hath not seen?

1 John 1:10

but if we say that we have not sinned, we make him a liar, and his word is not in us.

John 3:19-21

And this is the condemnation, that light is come into the world, and men loved darkness rather than light, because their deeds were evil.

John 12:35

Then Jesus said unto them, Yet a little while the light is to be with you; walk while ye have the light, least darkness overtake you; for he that walketh in the dark knoweth not whither he goeth.

1 John 2:4

He that saith, I know Him, and keepeth not his commandments, is a liar, and the truth is not in him.

Revelation 3:17-18

because thou sayst, I am rich, and wealthy, and have want of nothing; and knowest not that thou art wretched, and miserable, and poor, and blind, and naked.

Matthew 7:22

many will say to me in that day, Lord, Lord, have we not prophesied in thy name, and in thy name have cast out devils, and in thy name have wrought many miracles? and I will then declare unto them,

John 8:12

Then spake Jesus again to them, saying, I am the light of the world; he, that followeth me, shall not walk in darkness, but shall have the light of life.

John 8:44-45

Ye are of your father the devil, and are bent upon doing the lusts of your father: he was a murderer from the beginning, and continued not in the truth: for there is no truth in him. When he speaketh a lie, he speaketh like himself, for he is a liar, and the father of such.

John 11:10

but if any one walk in the night, he stumbleth; because he hath no light.

John 12:46

I am come a light into the world, that whosoever believeth on me, might not abide in darkness.

2 Corinthians 6:14-16

Be not unsuitably connected with infidels: for what fellowship hath righteousness with unrighteousness? or what communion hath light with darkness?

1 Timothy 4:2

and doctrines of demons founded in the hypocrisy of liars, who are seared in their own conscience, forbidding to marry,

James 2:14

What is the advantage, my brethren, if any one say that he has faith, and he hath not works, can faith alone save him?

James 2:16

and one of you say to them, Go in peace, be ye warmed and be ye filled: but ye give them not the necessaries of life, what profit is it to them?

James 2:18

But one may say, Thou hast faith, and I have works: shew me thy faith by thy works, and I will shew thee my faith by my works.

1 John 1:3

and was manifested unto us) what we have seen and heard we declare unto you, that ye also may have communion with us: and our communion is with the Father and with his Son Jesus Christ.

1 John 1:8

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

1 John 2:9-11

Now he that saith he is in the light, and hateth his brother, is still in darkness:

Treasury of Scripture Knowledge

Summary

If we say that we have fellowship with him, and walk in darkness, we lie, and do not the truth:

Do not

Bible References

If

1 John 1:8
If we say that we have no sin, we deceive ourselves, and the truth is not in us.
1 John 2:4
He that saith, I know Him, and keepeth not his commandments, is a liar, and the truth is not in him.
1 John 4:20
I love God, and hateth his brother, he is a liar: for how can he, that loveth not his brother, whom he hath seen, love God whom he hath not seen?
Matthew 7:22
many will say to me in that day, Lord, Lord, have we not prophesied in thy name, and in thy name have cast out devils, and in thy name have wrought many miracles? and I will then declare unto them,
James 2:14
What is the advantage, my brethren, if any one say that he has faith, and he hath not works, can faith alone save him?
Revelation 3:17
because thou sayst, I am rich, and wealthy, and have want of nothing; and knowest not that thou art wretched, and miserable, and poor, and blind, and naked.

Fellowship

1 John 1:3
and was manifested unto us) what we have seen and heard we declare unto you, that ye also may have communion with us: and our communion is with the Father and with his Son Jesus Christ.
2 Corinthians 6:14
Be not unsuitably connected with infidels: for what fellowship hath righteousness with unrighteousness? or what communion hath light with darkness?

We lie

1 John 1:10
but if we say that we have not sinned, we make him a liar, and his word is not in us.
1 John 4:20
I love God, and hateth his brother, he is a liar: for how can he, that loveth not his brother, whom he hath seen, love God whom he hath not seen?
John 8:44
Ye are of your father the devil, and are bent upon doing the lusts of your father: he was a murderer from the beginning, and continued not in the truth: for there is no truth in him. When he speaketh a lie, he speaketh like himself, for he is a liar, and the father of such.
1 Timothy 4:2
and doctrines of demons founded in the hypocrisy of liars, who are seared in their own conscience, forbidding to marry,

Do not

John 3:21
But he that acts according to truth, cometh to the light, that his deeds may be made manifest, that they are wrought in God.