New Revised Standard Version
If we say that we have fellowship with him while we are walking in darkness, we lie and do not do what is true;

Contemporary English Version
If we say we share in life with God and keep on living in the dark, we are lying and are not living by the truth.

New American Bible
If we say, “We have fellowship with him,” while we continue to walk in darkness, we lie and do not act in truth.

Douay-Rheims Bible
If we say that we have fellowship with him and walk in darkness, we lie and do not the truth.

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

If.

1 John 1:8,10 If we say that we have no sin, we deceive ourselves and the truth is not in us. . . .

1 John 2:4 He who saith that he knoweth him and keepeth not his commandments is a liar: and the truth is not in him.

1 John 4:20 If any man say: I love God, and hateth his brother; he is a liar. For he that loveth not his brother whom he seeth, how can he love God whom he seeth not?

Matthew 7:22 Many will say to me in that day: Lord, Lord, have not we prophesied in thy name, and cast out devils in thy name, and done many miracles in thy name?

James 2:14,16,18 What shall it profit, my brethren, if a man say he hath faith, but hath not works? Shall faith be able to save him? . . .

Revelation 3:17,18 Because thou sayest: I am rich and made wealthy and have need of nothing: and knowest not that thou art wretched and miserable and poor and blind and naked. . . .

fellowship.

1 John 1:3 That which we have seen and have heard, we declare unto you: that you also may have fellowship with us and our fellowship may be with the Father and with his Son Jesus Christ.

Psalm 5:4-6 In the morning I will stand before thee, and I will see: because thou art not a God that willest iniquity. . . .

Psalm 94:20 Doth the seat of iniquity stick to thee, who framest labour in commandment?

2 Corinthians 6:14-16 Bear not the yoke with unbelievers. For what participation hath justice with injustice? Or what fellowship hath light with darkness? . . .

walk.

1 John 2:9-11 He that saith he is in the light and hateth his brother is in darkness even until now. . . .

Psalm 82:5 They have not known nor understood: they walk on in darkness: all the foundations of the earth shall be moved.

Proverbs 2:13 Who are glad when they have done evil, and rejoice in the most wicked things:

Proverbs 4:18,19 The way of the wicked is darksome: they know not where they fall. . . .

John 3:19,20 And this is the judgment: Because the light is come into the world and men loved darkness rather than the light: for their works were evil. . . .

John 11:10 But if he walk in the night, he stumbleth, because the light is not in him.

John 12:35,46 Jesus therefore said to them: Yet a little while, the light is among you. Walk whilst you have the light, and the darkness overtake you not. And he that walketh in darkness knoweth not whither be goeth. . . .

we lie.

1 John 1:10 If we say that we have not sinned, we make him a liar: and his word is not in us.

1 John 4:20 If any man say: I love God, and hateth his brother; he is a liar. For he that loveth not his brother whom he seeth, how can he love God whom he seeth not?

John 8:44,45 You are of your father the devil: and the desires of your father you will do. He was a murderer from the beginning: and he stood not in the truth, because truth is not in him. When he speaketh a lie, he speaketh of his own: for he is a liar, and the father thereof. . . .

1 Timothy 4:2 Speaking lies in hypocrisy and having their conscience seared,

do not.

John 3:21 But he that doth truth cometh to the light, that his works may be made manifest: because they are done in God.