《黄帝内经·灵枢·阴阳系日月》
黄帝问：在五行归类中，方位的东方和天干中的甲、乙都属木，木气旺于春季，在五色中主青色，在五脏中主肝脏，隶属肝的经脉是足厥阴肝经，现在却把甲配属身体左侧上肢的手少阳三焦经，不符合天干配属五行的规律，这是为什么呢？
黄帝曰：五行以东方为甲乙木，主春，春者苍色，主肝，肝者足厥阴也。今乃以甲为左手之少阳，不合于数，何也？
The Yellow Emperor asked: In the classification of the five elements, the direction of the East and the heavenly stems Jia and Yi belong to the wood, and the wood energy is active in spring, the color is green among the five colors, and the liver among the five internal organs. The meridians belong to the liver, but now they are attributed to the hand Shaoyang Sanjiao Meridian on the left side of the body. This does not conform to the rule of matching the heavenly stems with the five elements. Why is this?