The verse numbering varies slightly between English versions and the Greek. Most English versions number the verses 11-14; in the Greek NT the verses are numbered 11-13 in UBS5/NA28.
The oldest known MSS containing the text of 2 Cor 13:11-13 (in the Greek) is P46 which is dated to about 200 AD. Here is an image of the pertinent page with the last three verses (including the last four words of V10):
The text is quite legible and the text (as checked by myself) is almost identical to that in UBS5, viz:
καὶ οὐκ εἰς καθαίρεσιν. Λοιπόν, ἀδελφοί, χαίρετε, καταρτίζεσθε, παρακαλεῖσθε, τὸ αὐτὸ
φρονεῖτε, εἰρηνεύετε, καὶ ὁ Θεὸς τῆς ἀγάπης καὶ εἰρήνης ἔσται μεθ’
ὑμῶν. Ἀσπάσασθε ἀλλήλους ἐν ἁγίῳ φιλήματι. Ἀσπάζονται ὑμᾶς οἱ ἅγιοι
πάντες. Ἡ χάρις τοῦ Κυρίου Ἰησοῦ Χριστοῦ καὶ ἡ ἀγάπη τοῦ Θεοῦ καὶ ἡ
κοινωνία τοῦ Ἁγίου Πνεύματος μετὰ πάντων ὑμῶν.
Obviously, the MSS is in all capital letters (as was the custom of the time) and the modern text uses lower-case letters as well.