Commentaries:
Jamieson, Fausset, and Brown
hateth—equivalent to "loveth not" (I John 3:14); there is no medium between the two. "Love and hatred, like light and darkness, life and death, necessarily replace, as well as necessarily exclude, one another" [ALFORD].
is a murderer—because indulging in that passion, which, if followed out to its natural consequences, would make him one. "Whereas, I John 3:16 desires us to lay down our lives for the brethren; duels require one (awful to say!) to risk his own life, rather than not deprive another of life" [BENGEL]. God regards the inward disposition as tantamount to the outward act which would flow from it. Whomsoever one hates, one wishes to be dead.
hath—Such a one still "abideth in death." It is not his future state, but his present, which is referred to. He who hates (that is, loveth not) his brother (I John 3:14), cannot in this his present state have eternal life abiding in him.
Other Jamieson, Fausset, and Brown entries containing 1 John 3:15:
Isaiah 1:21
Matthew 5:22
Romans 14:20
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