《北史·列传·卷三十》
现在正值隆冬，公务较少，田野罄尽，农夫闲暇，迁移郊外祭坛，较为方便。 
今玄冬务隙，野罄人闲，迁易郊坛，二三为便。
It is now midwinter, there is less official business, the fields are exhausted, and the farmers are at leisure. It is more convenient to move the suburban altars.