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Ephesians 4:3 (WEB)
being eager to keep the unity of the Spirit in the bond of peace.

Catechism · 2

§814Paragraph 3 · The Church is One, Holy, Catholic, and ApostolicRead at vatican.va
“Yet sin and the burden of its consequences constantly threaten the gift of unity. and so the Apostle has to exhort Christians to "maintain the unity of the Spirit in the bond of peace."” — Catechism footnote: Eph 4:3.

§957Paragraph 5 · The Communion of SaintsRead at vatican.va
“Exactly as Christian communion among our fellow pilgrims brings us closer to Christ, so our communion with the saints joins us to Christ, from whom as from its fountain and head issues all grace, and the life of the People of God itself"” — Catechism footnote: LG 50; cf. Eph 4:1-6.

Cyprian of Carthage, Epistles Letter 51
“…from the unity which God has appointed, and says, “Bearing with one another in love, endeavouring to keep the unity of the Spirit in the bond of peace.”” — editor's note: Eph. iv. 2, 3.
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Cyprian of Carthage, On the Advantage of Patience
“And in another place: “Forbearing one another,” he says, “in love, using every effort to keep the unity of the spirit in the bond of peace.”” — editor's note: Eph. iv. 2, 3.
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Cyprian of Carthage, On the Unity of the Church
“And again, he says, “Forbearing one another in love, endeavouring to keep the unity of the Spirit in the bond of peace.”” — editor's note: Eph. iv. 3.
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Gregory the Great, Epistles, Books I–VIII V.22Book V
“…one shepherd; and let us be ever mindful how the preacher of truth admonishes us, saying, Be careful to keep the unity of the spirit in the bond of peace (Ephes. iv. 3), and, Follow peace with all men, and holiness, without which no man shall see God (Hebr. xii. 14).” — the author cites it
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Gregory the Great, Epistles, Books I–VIII VII.2Book VII
“And Paul the apostle admonishes, saying, Endeavouring to keep the unity of the Spirit in the bond of peace (Ephes. iv. 3).” — the author cites it
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Gregory the Great, Epistles, Books I–VIII VII.19Book VII
“…grave offence is engendered in the Churches, thus fulfilling in all ways what is written, Endeavouring to keep the unity of the Spirit in the bond of peace (Ephes. iv. 3): and again, Give none occasion to the adversary to speak reproachfully (1 Tim. v. 14).” — the author cites it
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Gregory the Great, The Book of Pastoral Rule III.23Part III
“Hence again he admonishes, saying, Endeavouring to keep the unity of the Spirit in the bond of peace: there is one body and one Spirit, even as ye are called in one hope of your calling (Eph. iv. 3, 4).” — the author cites it
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Augustine of Hippo, Expositions on the Psalms Psalm 96
“For there what was old was destroyed, that what was new might be built up.…The Apostle bindeth us together into this very structure, and fasteneth us when bound together in that unity, saying, “Forbearing one another in love; endeavouring to keep the unity of the Spirit in the bond of peace.”” — editor's note: Eph. iv. 2, 3.
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Augustine of Hippo, Homilies on the First Epistle of John Homily 1
“As Paul saith, “Forbearing one another in love, studying to keep the unity of the Spirit in the bond of peace.”” — editor's note: Eph. iv. 2, 3.
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Augustine of Hippo, On the Holy Trinity VI.5Book VI
“…but by their own essence, neither by the gift of any superior, but by their own, they are “keeping the unity of the Spirit in the bond of peace;” which we are commanded to imitate by grace, both towards God and towards ourselves.” — editor's note: Eph. iv. 3
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Augustine of Hippo, Sermons on New Testament Lessons Sermon 21
“Whence the Apostle says, “Endeavouring to keep the unity of the Spirit in the bond of peace.”” — editor's note: Eph. iv. 3.
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Augustine of Hippo, Sermons on New Testament Lessons Sermon 38
“So then let us embrace charity, “studying to keep the unity of the Spirit in the bond of peace.”” — editor's note: Eph. iv. 3.
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Athanasius of Alexandria, Festal and Personal Letters Festal Letters.8Festal Letters
“For although place separate us, yet the Lord the Giver of the feast, and Who is Himself our feast, Who is also the Bestower of the Spirit, brings us together in mind, in harmony, and in the bond of peace.” — editor's note: Cf. Eph. iv. 3
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Leo the Great, Letters Letter 10
“…various matters of appeal, as the old usage demanded, it has reversed or confirmed decisions: and in this way “the unity of the spirit in the bond of peace” has been kept, and by the interchange of letters, our honourable proceedings have promoted a lasting affection: for “seeking not our own but the things of…” — editor's note: Eph. iv. 3.
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Leo the Great, Sermons Sermon 95
“Whereas they who are in mind always with God, “giving diligence to keep the unity of the Spirit in the bond of peace,” never dissent from the eternal law, uttering that prayer of faith, “Thy will be done as in heaven so on earth.”” — editor's note: Eph. iv. 3.
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Tertullian, On the Veiling of Virgins Chapter 2
“They and we have one faith, one God, the same Christ, the same hope, the same baptismal sacraments; let me say it once for all, we are one Church.” — editor's note: Comp. Eph. iv. 1–6.
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