《隋书·帝纪·卷一》
六月二十九日，高祖下诏因即位之初，赤雀从天下降吉祥，五德相生，而赤是火的颜色，于是下诏令除冬至日在南郊祭天以及祭土神之日，仍按常规穿戴的礼仪外，其余的如朝会的穿戴，旗帜和祭祀用的牲口的颜色，一律用红色。
六月癸未，诏以初受天命，赤雀降祥，五德相生，赤为火色，其郊及社庙，依服冕之仪，而朝会之服，旗帜牺牲，尽令尚赤。
On June 29, Emperor Gaozu declared in an edict regarding the commencement of his reign, an auspicious omen of the auspicious reign of the red sparrow in the world, the five elements were born with each other, and the red is the color of fire, so in the edict, it was ordered to be removed. In addition to the regular rituals for sacrificing to the heavens and the god of soil during the winter solstice in the southern suburbs, the remaining rituals such as the clothing worn at the imperial court, the colors of the flags and the livestock used for sacrifices should all be red.