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Galatians 6:15 (WEB)
For in Christ Jesus neither is circumcision anything, nor uncircumcision, but a new creation.

Catechism · 1

§1214Article 1 · The Sacrament of BaptismRead at vatican.va
“This sacrament is called Baptism, after the central rite by which it is carried out: to baptize (Greek baptizein) means to "plunge" or "immerse"; the "plunge" into the water symbolizes the catechumen's burial into Christ's death, from which he rises up by resurrection with him, as "a new creature."” — Catechism footnote: 2 Cor 5:17; Gal 6:15; Cf. Rom 6:34; Col 2:12.

Athanasius of Alexandria, Against the Arians II.6Discourse II
“Nor shall we have to watch against woman beguiling us, for ‘in the resurrection they neither marry nor are given in marriage, but are as the Angels;’ and in Christ Jesus it shall be ‘a new creation,’ and ‘neither male nor female, but all and in all Christ;’ and where Christ is, what fear, what danger can still happen?” — editor's note: Gal. vi. 15; iii. 28.
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Jerome, Letters Letter 69
“Yes, for “in Christ Jesus neither circumcision availeth anything nor uncircumcision but a new nature.”” — editor's note: Gal. vi. 15, ‘nature’ for ‘creature,’ a slip of memory.
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Hippolytus of Rome, The Refutation of All Heresies V.2Book V
“For, says (the Naassene), Attis has been emasculated, that is, he has passed over from the earthly parts of the nether world to the everlasting substance above, where, he says, there is neither female or male, but a new creature, a new man, which is hermaphrodite.” — editor's note: See 2 Cor. v. 17; Gal. vi 15.
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Hippolytus of Rome, The Refutation of All Heresies X.29Book X
“This Logos we know to have received a body from a virgin, and to have remodelled the old man by a new creation.” — editor's note: πεφυρακότα. This is the reading adopted by Cruice and Wordsworth. The translator has followed Cruice’s rendering, refinxisse, while Dr. Wordsworth construes…
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