《汉书·志·五行志上》
到了刘向的儿子刘歆研究《左氏传》，他对《春秋》的解说也已经有所违背了；他们谈《五行传》，又很不相同了。
至向子歆治《左氏传》，其《春秋》意亦已乖矣；言《五行传》，又颇不同。
When it was Liu Xiang's son Liu Xin who studied 'The Zuo zhuan', his interpretations of Spring and Autumn Annals had already violated some of the rules. When they talked about Wuxingzhuan, they were very different.