《资治通鉴·晋纪·晋纪三十二》
按照北魏的旧习俗，每年的夏初都要祭祀天神和宗祖庙，每年的夏末都要率领部众去阴山作退霜的祈祷，每年的秋季刚开始时要去西郊祭天。
魏之旧俗，孟夏祀天及东庙，季夏帅众却霜于阴山，孟秋祀天于西郊。
According to the old customs of the Northern Wei, every early summer sacrifices were offered to the gods and ancestral temples, and in the late summer the tribesmen would be led to Yinshan to pray for the end of frost, and at the beginning of autumn, they would go to the western suburbs to worship the heavens.