《黄帝内经·灵枢·五禁》
壬癸应脚和小腿，每逢壬日和癸日，不能刺脚和小腿的穴位。这就是所说的五禁。
壬癸日自乘，无刺足胫，是谓五禁。
Renkui should be heard on the feet and calves. Every Renri and Kjiri, you cannot pierce the acupoints of the feet and calves. This is what is called five bans.