1 John 4:20

If any one say, Indeed I love God, and yet hate his brother, he is a liar: for he who loves not his brother, whom he has seen, how can he love God, whom he has not seen?

1 John 2:4

He who says, I have known him, and does not keep his commandments, is a liar, and the truth is not in this man.

1 John 2:9

He who says he is in the light and yet hates his brother, is in the darkness till now.

1 John 3:17

Whoever, therefore, has the goods of this world, and sees his brother in need, and yet shuts up his compassion from him, how abides the love of God in him?

1 John 4:12

No one has seen God, at any time. If we love one another, God abides in us, and his love is made perfect in us.

1 John 2:11

But he who hates his brother, is in the darkness, and walks in that darkness, and does not know whither he goes; because the darkness has blinded his eyes.

1 John 1:6

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

Treasury of Scripture Knowledge

Summary

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

Bible References

A man

1 John 2:4
He who says, I have known him, and does not keep his commandments, is a liar, and the truth is not in this man.
1 John 3:17
Whoever, therefore, has the goods of this world, and sees his brother in need, and yet shuts up his compassion from him, how abides the love of God in him?

Not

1 John 4:12
No one has seen God, at any time. If we love one another, God abides in us, and his love is made perfect in us.