precept

[1]	rule , principle , guide , principle , unwritten law , canon , guideline , dictate , code , injunction , law , commandment , instruction , injunction , directive , prescription , mandate , charge , statute , regulation , edict , ukase , decree , order , fiat , ordinance
[2]	maxim , teaching , commandment , proverb , axiom , motto , slogan , saying , byword , aphorism , apophthegm/apothegm