《史记·十二本纪·孝文本纪》
十六年，皇帝亲自郊祀渭阳五帝庙，也在夏天举行祭礼，决定崇尚赤色。
十六年，上亲郊见渭阳五帝庙，亦以夏答礼而尚赤。
In the sixteenth year, the emperor personally paid homage to the Temple of Five Emperors in Weiyang suburbs, and also held a sacrificial ceremony in the summer, deciding to worship the color red.