Beloved, being very eager to write to you of our common salvation, I found it necessary to write appealing to you to contend for the faith which was once for all delivered to the saints.
Ἀγαπητοί, πᾶσαν σπουδὴν ποιούμενος γράφειν ὑμῖν περὶ τῆς κοινῆς ἡμῶν σωτηρίας ἀνάγκην ἔσχον γράψαι ὑμῖν παρακαλῶν ἐπαγωνίζεσθαι τῇ ἅπαξ παραδοθείσῃ τοῖς ἁγίοις πίστει.
Haydock Catholic Bible Commentary: Jude
Being very solicitous to discharge my duty of an apostle, in writing and instructing you in the common concern of your salvation, I judge it necessary at present to write this letter, to exhort you to contend earnestly, and stand firm in the Christian faith. Wi.