by sacrifice

  Psalms 50.5:Gather my saints together unto me; those that have made a covenant with me by sacrifice.  

a message from the book of mormon
helama 6

21 But behold, Satan did stir up the hearts of the more part of the Nephites, insomuch that they did unite with those bands of robbers, and did enter into their covenants and their oaths, that they would protect and preserve one another in whatsoever difficult circumstances they should be placed, that they should not suffer for their murders, and their plunderings, and their stealings.

22 And it came to pass that they did have their signs, yea, their secret signs, and their secret words; and this that they might distinguish a brother who had entered into the covenant, that whatsoever wickedness his brother should do he should not be injured by his brother, nor by those who did belong to his band, who had taken this covenant.

23 And thus they might murder, and plunder, and steal, and commit whoredoms and all manner of wickedness, contrary to the laws of their country and also the laws of their God.

24 And whosoever of those who belonged to their band should reveal unto the world of their wickedness and their abominations, should be tried, not according to the laws of their country, but according to the laws of their wickedness, which had been given by Gadianton and Kishkumen.

25 Now behold, it is these secret oaths and covenants which Alma commanded his son should not go forth unto the world, lest they should be a means of bringing down the people unto destruction.

26 Now behold, those secret oaths and covenants did not come forth unto Gadianton from the records which were delivered unto Helaman; but behold, they were put into the heart of Gadianton by that same being who did entice our first parents to partake of the forbidden fruit