《太平广记·卷二百零七·书二》
晋帝时，更换祭北郊文的祝板。工匠们刻的字，王羲之书写的，笔锋入木三分。
晋帝时，祭北郊文，更祝板，工人削之，笔入木三分。
During the Jin Dynasty, the sacrificial boards for the Northern Suburb were changed. The characters engraved by the craftsmen were written by Wang Xizhi, with brushstrokes that penetrated the wood by three points.