Earnestly Contend for the Faith

The book of Jude is a warning regarding apostasy.
“Apostasy, ‘falling away,' is the act of professed Christians who deliberately reject revealed truth. Scofield Study Bible (pp. 1280, 1281).
The apostate is perfectly described in II Timothy 4:3, 4. Apostates depart from the faith, but not from the outward profession of Christianity (II Timothy 3:5). Apostate teachers are described in II Timothy 4:3; II Peter 2:1—19; Jude 4, 8, 11-13, 16. Apostasy in the church, as in Israel (Isaiah 1:5, 6; 5:5-7) is irremediable, and awaits judgment (II Thess. 2:10-12; II Peter 2:17, 21; Jude 11-15; Revelation 3:14-16).
We must “earnestly contend for the faith” (vs. 3). The Bible says, “For the grace of God that bringeth salvation hath appeared to all men, Teaching us that, denying ungodliness and worldly lusts” (Titus 2:11, 12).