Where does the frost come from on the sixth day of the sixth lunar month?

On the sixth day of Kun, wear (1) frost and quench the ice to (2).

Walking on the frosty land on the sixth day of the sixth lunar month indicates that the freezing season has arrived.

Note: (1) "Step" on ... Up. The Book of Songs Xiaoya Xiao Min: "Be afraid, like an abyss, like walking on thin ice."

2 "to" is. The Analects of Confucius: "I don't know how old I am."