1 John 2:20

• §91Article 2 · The Transmission of Divine RevelationRead at vatican.va

  “They have received the anointing of the Holy Spirit, who instructs them” — Catechism footnote: Cf. I Jn 2:20, 27

Athanasius of Alexandria

• Athanasius of Alexandria, Against the Arians I.11Discourse I

  “From Him then we have begun to receive the unction and the seal, John saying, ‘And ye have an unction from the Holy One;’ and the Apostle, ‘And ye were sealed with the Holy Spirit of promise.’” — editor's note: 1 John ii. 20; Eph. i. 13.

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Cyril of Jerusalem

• Cyril of Jerusalem, Catechetical Lectures Lecture 22

  “1 John ii. 20–28” — the author cites it

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• John 16:13

  Cited together in Catechism §91.