Folk tales of mystery

Butchers don't kill five-fingered pigs. The guardian of a village does not guard a village with a temple. Feng shui masters don't tell evil dragons what to do. Midwives' hands must be washed with rooster blood. There are 360 lines in the world, and there are rules in every line. Are these ancient and mysterious rules really formal? Would you believe me if I told you that there are rules you can't break, that breaking them could endanger your life?