What is the name of the Assassin Brotherhood's first established creed rule in the games?

The first established creed rule in the games is “Stay your blade from the flesh of an innocent.” It is the first of the three principal tenets recited by members of the Assassin Brotherhood.

The other two rules are “Hide in plain sight” and “Never compromise the Brotherhood.” Together, they guide the fictional organization's conduct, especially its use of targeted violence and secrecy. The wording is presented as part of the series' lore rather than as a general historical code of medieval assassins.

“Nothing is true, everything is permitted” is the Brotherhood's famous maxim, but it is not the first numbered rule. “Leap of faith” is a recurring Assassin technique, not one of the three creed tenets.