“Jude, a bondservant of Jesus Christ, and brother of James, to those who are called, sanctified by God the Father, and preserved in Jesus Christ: Mercy, peace, and love be multiplied to you. Beloved, while I was very diligent to write to you concerning our common salvation, I found it necessary to write to you exhorting you to contend earnestly for the faith which was once for all delivered to the saints” (Jude 1-3).
“Once for all” identifies the distinctive finality of THE faith.
By the time the first century A. D. was completed, God’s revelation of the faith which offers the common salvation was also completed.
Through the many infallible proofs of miraculous confirmation, the perfect and final covenant of God was certified once for all time. There is no promise of or need for continued revelation after the once-for-all faith was delivered to Jude and his fellow first century saints.
To contend that additional revelation was given to any others than the eight apostles and prophets who penned the New Testament is to call Jude a liar, the Spirit of truth (John 16:13) who inspired his writing a liar, and the God who cannot lie (Titus 1:2) a liar.