[Jude] is saying, you were called, you were sanctified, and by the way, you were being preserved by Jesus. Concerning that last statement, I wonder if Jude, not having believed in his Brother and then coming to saving faith in Jesus Christ, saw that God had kept him, had preserved him, had sustained him. Through all the unbelieves that he had lived in, in the face of living under the same roof with Jesus Christ, Jude was now realizing that God had kept him, was keeping him, and would keep him.

Notice how he ends his book in Jude 1:24, that great benediction: Now to him who is able to keep you from stumbling. At the end of the day, everything that Jude said in this book—all the dangers bearing down on the church, all the exhortations not to tolerate those things and false teachers—all of that is not built on our own effort, our own wisdom, our own foresight, or our own strength; it is built on the fact that we are being preserved by Jesus Christ, and that Satan's great desire is to pull you away from Jesus, the truth, and the sound doctrine, but all the while Jesus is there, preserving.¹

Nick Batzig