1 John 3:5

• §457Paragraph 1 · The Son of God Became ManRead at vatican.va

  “The Word became flesh for us in order to save us by reconciling us with God, who "loved us and sent his Son to be the expiation for our sins": "the Father has sent his Son as the Saviour of the world", and "he was revealed to take away sins":” — Catechism footnote: I Jn 4:10; 4:14; 3:5.

Augustine of Hippo

• Augustine of Hippo, Homilies on the First Epistle of John Homily 4

  “Hear what He saith: “And ye know that He was manifested to take away sin; and sin in Him is not.”” — editor's note: 1 John iii. 5.

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Tertullian

• Tertullian, On Modesty Chapter 19

  “Herein are manifest the sons of God and the sons of the devil.”” — editor's note: 1 John iii. 3–10.

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• 1 John 4:10

  Cited together in Catechism §457.

• 1 John 4:14

  Cited together in Catechism §457.