Theophylact of Bulgaria
The Apostle Peter had already spoken of them, but the Apostle Jude writes at greater length. He says that they are appointed beforehand because the Apostles Peter and Paul had already written that deceivers of this kind would come in the last time (2 Pet 2:1-2; 2 Pet 3:3; 2 Tim 3:1-8).
Even before them Christ Himself said, “Many will come in My name and will deceive many. Do not go after them” (Lk 21:8). By calling themselves Christians, they would deceive many through this name.
The Apostle speaks of the followers of the most vile Nicholas, Valentinus, and Simon. Being gluttonous and incontinent, they gave their teaching a plausible covering in order to gain entrance into houses and captivate women laden with sins.
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Having invented certain nocturnal rites, they gave themselves over to corruption. From this also comes their denial of our Lord Jesus Christ.
For how could those not deny Him who drive away from themselves, by their unclean life, the Teacher of all chastity? For what fellowship has light with darkness (2 Cor 6:14)?
He exhorts those who once acknowledged our Lord Jesus Christ as Savior and believed in Him to contend for the faith.
For if we have received the Word become man, and yet say that He Who is from the Father before the ages is one, and He Who is from the Mother is another, and that this latter is a separate person, how do we not deny the one Lord and Master?
For the Lord Jesus is one according to the union of the divine economy. The pre-eternal Word of God, Himself God, is the same one Master of all from the very conception.
He has the flesh, received by Him from the Holy Virgin, planted in the glory of the Godhead.