And, having elected as chief of their conspiracy the eldest of their body, who also, with a few of those who joined in this audacious folly, was the leader of the whole enterprise, they left the outer courts and precincts of the tabernacle and entered into the most holy places, expelling those who, by the oracular commands of God, had been thought worthy of the priesthood. (De praemiis et poenis, 75)
And before now some persons, wishing to be kings instead of doorkeepers, and to put an end to the most beautiful thing in life, namely order, having not only failed in obtaining the success which they hoped to meet with through injustice, but have even been compelled to part with that which they had in their hands; for the law tells us that the companions of Korah, who coveted the priesthood, lost both what they wished for and what they had: (De fuga et inventione, 145)
For a discussion of Korah's rebellion and Jude 11, and how such supports the existence of an ordained New Covenantal Priesthood, see pp. 72-75 of my book
One can also pursue my The LDS Priesthoods: Resource Page for a listing of articles on the Priesthood.