《宋书·志·卷三十一》
晋代五行属金，要用火烧铁的办法治疗疾患，指一定要除去自己同类，因而招来火与金联合起来，依靠金火的旺气共治虫害。 
金者晋行，火烧铁以治疾者，言必去其类而来，火与金合德，共治虫害也。
The Jin Dynasty belongs to gold in the five elements. It is necessary to use the method of burning iron with fire to treat diseases, which means it is necessary to eliminate one's own kind, so as to invite the union of fire and gold, and rely on the strong energy of gold and fire to treat pests together.