The reading is from St. Jude's First Universal Letter 1:1-10

Jude, a servant of Jesus Christ, and brother of James,

To those who are called, beloved in God the Father and kept for Jesus Christ:

May mercy, peace, and love be multiplied to you.

Beloved, being very eager to write to you of our common salvation, I found it necessary to write appealing to you to contend for the faith which was once for all delivered to the saints. For admission has been secretly gained by some who long ago were designated for this condemnation, ungodly persons who pervert the grace of our God into licentiousness and deny the only Master and our Lord Jesus Christ.

Now I desire to remind you, though you were once for all fully informed, that the Lord saved a people out of the land of Egypt, afterward destroyed those who did not believe. And the angels that did not keep their own position but left their proper dwelling have been kept by him in eternal chains in the nether gloom until the judgment of the great day; just as Sodom and Gomorrah and the surrounding cities, which likewise acted immorally and indulged in unnatural lust, serve as an example by undergoing a punishment of eternal fire.

Yet in like manner these men in their dreamings defile the flesh, reject authority, and revile the glorious ones. But when the archangel Michael, contending with the devil, disputed about the body of Moses, he did not presume to pronounce a reviling judgment upon him, but said, "The Lord rebuke you." But these men revile whatever they do not understand, and by those things that they know by instinct as irrational animals, they are destroyed.