《淮南子·时则训》
在这个月内，命令太祝祈祷、祭祀神灵，并用龟和蓍草占卜占筮，审视卦象以观察凶吉。
是月命太祝祷祀神位，占龟策，审卦兆，以察吉凶。
During this month, he ordered the grand priest to pray, worship the gods, and divine with tortoises and yarrow stalks, examining the hexagram to observe the good and bad luck.