These are the ones who cause divisions, who are worldly and devoid of the Spirit.
19. These be they who separate themselves. Some Greek copies have the participle by itself, other copies add ἑαυτοὺς, “themselves;” but the meaning is nearly the same. He means that they separated from the Church, because they would not bear the yoke of discipline, as they who indulge the flesh dislike spiritual life.
Here, I. The apostle enlarges further on the character of these evil men and seducers: they are murmurers, complainers, etc., Jde 1:16. Observe, A murmuring complaining temper, indulged and expressed, lays men under a very bad character; such are very weak at least, and for the most part very wicked.
Commenting on Jude 1:16-25
Verse 19. These be they who separate themselves. That is, from their brethren, and from the work of benevolence and truth. Comp. . Sensual. Under the influence of gross passions and appetites. Having not the Spirit. The Holy Spirit, or the spirit of true religion. (d) "separate"