《元史·列传·卷六十八》
傒斯在史馆住宿，朝夕不能休息，因而得了寒疾，病七日而卒。
傒斯留宿史馆，朝夕不敢休，因得寒疾，七日卒。
Xi Si lived and worked in the history bureau day and night, so he suffered from an exposure-induced disease and died after suffering from it for 7 days.