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The code and guiding philosophy of the Assassin Order, upheld from at least the High Middle Ages until the modern era restricted unnecessary slaughter of innocents, preserved the reputation of oneself and of the Order, and was meant to create peace, not only within the world, but within the individual.
The Assassins had been handing it down orally from generation to generation, ensuring that its message was delivered to and upheld by every member of the Assassin Order. Al Mualim, one of the Mentors of the Order, once remarked that "[they] are nothing if [they] do not abide by the _____________."
What is Assassin's Creed? or What is Creed?
Bonus: What is a creed?