As revealed to Armand by Santino.
From The Vampire Lestat, by Anne Rice.

First Law

That each coven must have its leader and only he might order the working of the Dark Trick upon a mortal, seeing that the methods and the rituals were properly observed.

Second Law

That the Dark Gifts must never be given to the crippled, the maimed, or to children, or to those who cannot, even with the Dark Powers, survive on their own. Be it further understood that all mortals who would receive the Dark Gifts should be beautiful in person so that the insult to God might be greater when the trick is done.

Third Law

That never should an old vampire work this magic lest the blood of the fledgeling be too strong. For all our gifts increase naturally with age, and the old ones have too much strength to pass on. Injury, burning — these catastrophes, if they do not destroy the Child of Satan will only increase his powers when he is healed. Yet Satan guards the flock from the powers of old ones, for almost all, without exception, go mad.

Fourth Law

That no vampire may ever destroy another vampire, except the coven master has the power of life and death over all of his flock. And it is, further, his obligation to lead the old ones and the mad ones into the fire when they can no longer serve Satan as they should. It is his obligation to destroy all vampires who are not properly made. It is his obligation to destroy those who are so badly wounded that they cannot survive on their own. And it is his obligation finally to seek the destruction of all outcasts and all those who have broken these laws.

Fifth Law

That no vampire shall ever reveal his true nature to a mortal and allow that mortal to live. No vampire must ever reveal the history of the vampires to a mortal and let the mortal live. No vampire must commit to writing the history of the vampires or any true knowledge of vampires lest such a history be found by mortals and believed. And a vampire's name must never be known to mortals, save from his tombstone, and never must any vampire reveal to mortals the location of his or any other vampire's lair.

Excerpt from The Vampire Lestat © 1985 Anne O'Brien Rice.