《太平广记·卷三十三·神仙三十三》
皇上下令让浙西道的杭州府调查这件事情。杭州府派人挖开马自然的坟墓，打开棺材一看，棺材里竟然只有一根竹枝而已。
敕浙西道杭州覆视之，发冢视棺，乃一竹枝而已。
The emperor ordered Hangzhou, the prefectural government of Zhexi District, to investigate the matter. Hangzhou sent people to dig up Ma Zi Ran's tomb and opened up the coffin. However, they found out there was only a bamboo branch inside the coffin.