《汉书·志·五行志中之下》
汉惠帝二年，在宜阳，天空下血雨，有一顷地那么大的地方。刘向认为这是赤眚。
惠帝二年，天雨血于宜阳，一顷所，刘向以为赤眚也。
In the second year of Emperor Hui of the Han dynasty, in Yixing, blood rained from the sky, an area as large as a hectare. Liu Xiang thought this was a red evil spirit.