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Ephesians 4:32 (WEB)
And be kind to one another, tender hearted, forgiving each other, just as God also in Christ forgave you.

Catechism · 1

§2842Article 3 · The Seven PetitionsRead at vatican.va
“Then the unity of forgiveness becomes possible and we find ourselves "forgiving one another, as God in Christ forgave" us.” — Catechism footnote: Eph 4:32.

Tertullian, On Modesty Chapter 2
“And so it will be becoming for ‘the sons of God’ too to be ‘pitiful-hearted’ and ‘peacemakers;’ ‘giving in their turn just as Christ withal hath given to us;’ ‘not judging, that we be not judged.’” — editor's note: Comp. Matt. x. 8; but the reference seems to be to Eph. iv. 32, where the Vulgate reads almost as Tertullian does, “donantes invicem, sicut et Deus in Christo…
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Tertullian, On the Resurrection of the Flesh Chapter 45
“Let all bitterness, and wrath, and anger, and clamour, and evil-speaking, be put away from you, with all malice: but be ye kind one to another, tender-hearted, forgiving one another, even as God in Christ hath forgiven you.”” — editor's note: Eph. iv. 25–32.
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Augustine of Hippo, Sermons on New Testament Lessons Sermon 33
“Here you have the rule.” — editor's note: Col. iii. 13; Eph. iv. 32.
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Augustine of Hippo, Sermons on New Testament Lessons Sermon 64
“But since we are speaking of the remission of sins, lest ye should think it too high a thing to imitate Christ, hear the Apostle saying, “Forgiving one another, even as God in Christ hath forgiven you.”” — editor's note: Col. iii. 13; Eph. iv. 32.
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