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1 John 3:15 (WEB)
Whoever hates his brother is a murderer, and you know that no murderer has eternal life remaining in him.

Catechism · 1

§1033Article 12 · "I Believe in Life Everlasting"Read at vatican.va
“Anyone who hates his brother is a murderer, and you know that no murderer has eternal life abiding in him."” — Catechism footnote: 1 Jn 3:14-15.

Augustine of Hippo, Homilies on the First Epistle of John Homily 5
“Lest ye should think it a light matter, brethren, to hate, or, not to love, hear what follows: “Every one that hateth his brother, is a murderer.”” — editor's note: 1 John iii. 15.
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Augustine of Hippo, Homilies on the First Epistle of John Homily 9
“Hast thou not heard above in this very epistle, “He that hateth his brother is a murderer”?” — editor's note: 1 John iii. 15.
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Augustine of Hippo, Sermons on New Testament Lessons Sermon 8
“Tremble then at least when it is said, “Whosoever hateth his brother is a murderer.”” — editor's note: 1 John iii. 15.
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Augustine of Hippo, Sermons on New Testament Lessons Sermon 32
“Whereas of the other it is said, “Whosoever hateth his brother is a murderer.”” — editor's note: 1 John iii. 15.
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Augustine of Hippo, Tractates on the Gospel of John Tractate 5
“Listen to the Apostle John: “He who hateth his brother is a murderer.”” — editor's note: 1 John iii. 15.
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Leo the Great, Letters Letter 115
“And since it is written: “he that hateth his brother is a murderer:” he has actually carried out what he was said already to have done in hate, as if he had never heard of this nor of that which the Lord says, “learn of Me;…” — editor's note: 1 John iii. 15.
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Jerome, Letters Letter 13
“The apostle and evangelist John rightly says, in his first epistle, that “whosoever hateth his brother is a murderer.”” — editor's note: 1 Joh. iii. 15.
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Tertullian, On Idolatry Chapter 2
“…murder to consist even in a word of curse or of reproach, and in every impulse of anger, and in the neglect of charity toward a brother just as John teaches, that he who hates his brother is a murderer.” — editor's note: 1 John. iii. 15.
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Cyprian of Carthage, On Jealousy and Envy
“For that he who is jealous of his brother, and has him in hatred, is bound by the guilt of homicide, the Apostle John declares in his epistle, saying, “Whosoever hateth his brother is a murderer; and ye know that no murderer hath life abiding in him.”” — editor's note: 1 John iii. 15.
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Cyprian of Carthage, On the Lord's Prayer
“…for the name of Christ, shall not be able to escape the crime of fraternal dissension, because, as it is written, “He who hateth his brother is a murderer,” and no murderer attains to the kingdom of heaven, nor does he live with God.” — editor's note: 1 John iii. 15.
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Cyprian of Carthage, Three Books of Testimonies Against the Jews III.4Book III
“For he who hateth his brother is a murderer; and ye know that no murderer hath eternal life abiding in him.”” — editor's note: 1 John iii. 10, 15.
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John Cassian, The Institutes VIII.20Book VIII
“For “whosoever is angry with his brother, is in danger of the judgment;” and “whosoever hateth his brother is a murderer;” viz., because in his heart he desires to kill him, whose blood we know that he has certainly not shed among men with his own hand or with a weapon; yet, owing…” — editor's note: 1 John iii. 15.
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Clement of Alexandria, The Stromata, or Miscellanies Chapter 2
“Ver.” — the author cites it
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Clement of Alexandria, Who is the Rich Man that shall be saved?
“Divinely and weightily John says, “He that loveth not his brother is a murderer,” the seed of Cain, a nursling of the devil.” — editor's note: 1 John iii. 14, 15.
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