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?

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?

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

If a man sayeth, 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?

if any one may say, 'I love God,' and his brother he may hate, a liar he is; for he who is not loving his brother whom he hath seen, God, whom he hath not seen, how is he able to love?

If a man say, I love God, and hates his brother, he is a liar: for he that loves not his brother whom he has seen, how can he love God whom he has not seen?

If any one says that he loves God, while he hates his brother man, he is a liar; for he who does not love his brother man whom he has seen, cannot love God whom he has not seen.

If a man says, I have love for God, and has hate for his brother, his words are false: for how is the man who has no love for his brother whom he has seen, able to have love for God whom he has not seen?

If a man says, 'I love God,' and hates his brother, he is a liar; for he who does not love his brother whom he has seen, cannot love God whom he has not seen.

If anyone says that he loves God, but hates his brother, then he is a liar. For he who does not love his brother, whom he does see, in what way can he love God, whom he does not see?

If someone says 'I love God,' and yet hates others, they are a liar. For the person who does not love their brother or sister, whom they have seen, cannot love God, whom they have not seen.

If a man say, I love God, and hateth his brother - His Christian brother; or, in a larger sense, any man. The sense is, that no man, whatever may be his professions and pretensions, can have any true love to God, unless he loves his brethren.
He is a liar - Compare the notes at 1-John 1:6. It is not necessary, in order to a proper interpretation of this passage, to suppose that he "intentionally" deceives. The sense is, that this must be a false profession.
For he that loveth not his brother whom he hath seen - It is more reasonable to expect that we should love one whom we have seen and known personally, than that we should love one whom we have not seen. The apostle is arguing from human nature as it is, and everyone feels that we are more likely to love one with whom we are familiar than one who is a stranger. If a professed Christian, therefore, does not love one who bears the divine image, whom he sees and knows, how can he love that God whose image he bears, whom he has not seen? Compare the notes at 1-John 3:17.

If a man say, I love God, and hateth his brother - This, as well as many other parts of this epistle, seems levelled against the Jews, who pretended much love to God while they hated the Gentiles; and even some of them who were brought into the Christian Church brought this leaven with them. It required a miracle to redeem St. Peter's mind from the influence of this principle. See Acts 10.
Whom he hath seen - We may have our love excited towards our brother,
1. By a consideration of his excellences or amiable qualities.
2. By a view of his miseries and distresses.
The first will excite a love of complacency and delight; the second, a love of compassion and pity.
Whom he hath not seen? - If he love not his brother, it is a proof that the love of God is not in him; and if he have not the love of God, he cannot love God, for God can be loved only through the influence of his own love. See on 1-John 4:19 (note). The man who hates his fellow does not love God. He who does not love God has not the love of God in him, and he who has not the love of God in him can neither love God nor man.

(15) If a man say, I love God, and hateth his brother, he is a liar: (16) for he that loveth not his brother whom he hath seen, how can he love God whom he hath not seen?
(15) As he showed that the love of our neighbour cannot be separate from the love with which God loves us because this last gives rise to the other: so he denies that the other kind of love with which we love God, can be separate from the love of our neighbour: of which it follows, that they who say they worship God, and yet do not regard their neighbours lie shamelessly.
(16) The first reason taken from comparison: why we cannot hate our neighbour and love God, that is, because he that cannot love his brother whom he sees, how can he love God whom he cannot see?

If a man say I love God, and hateth his brother,.... Than which profession nothing can be more contradictory, not black and white, or hot and cold in the same degree:
he is a liar; it is not truth he speaks, it is a contradiction, and a thing impossible:
for he that loveth not his brother whom he hath seen; his person, which might have drawn out his affection to him; and something valuable and worthy in him, which might have commanded respect; or his wants and distresses, which should have moved his pity and compassion:
how can he love God whom he hath not seen? it cannot be thought he should; the thing is not reasonable to suppose; it is not possible he should; See Gill on 1-John 4:12.

loveth not . . . brother whom he hath seen, how can he love God whom he hath not seen--It is easier for us, influenced as we are here by sense, to direct love towards one within the range of our senses than towards One unseen, appreciable only by faith. "Nature is prior to grace; and we by nature love things seen, before we love things unseen" [ESTIUS]. The eyes are our leaders in love. "Seeing is an incentive to love" [œCUMENIUS]. If we do not love the brethren, the visible representatives of God, how can we love God, the invisible One, whose children they are? The true ideal of man, lost in Adam, is realized in Christ, in whom God is revealed as He is, and man as he ought to be. Thus, by faith in Christ, we learn to love both the true God, and the true man, and so to love the brethren as bearing His image.
hath seen--and continually sees.

Whom he hath seen - Who is daily presented to his senses, to raise his esteem, and move his kindness or compassion toward him.