《逸周书·卷六·月令解》
这个月，天子开始穿皮农。命令主管官吏说。 天气上腾，地气下降，天地之间不再相通，封闭而形成冬天。 
是月也，天子始裘，命有司曰：天子天气上腾，地气下降，天地不通，闭塞而成冬。
This month, the emperor began to wear a fur robe. He ordered the official in charge to say. The weather rises, the earth's air descends, and heaven and earth are no longer connected, closed and forming winter.