釋氏要覽 3.41

3.41

寶林傳云。西天第五祖優波毱多有石室。縱十八肘（肘長尺八南北三丈二尺四寸）。廣十二肘（東西二丈一尺六寸）。受學者有一得道。則擲一四寸籌於室中。籌遂滿室。至毱多滅度將室中籌茶毗之。

The Baolin zhuan says: ‘The Fifth Patriarch of the Western Regions, Upagupta, had a stone chamber eighteen cubits long (a cubit being one chi eight cun; thirty-two chi and four cun from north to south) and twelve cubits wide (twenty-one chi and six cun from east to west). Whenever one of his students attained the Way, he threw a four-cun tally into the chamber. The tallies eventually filled the chamber. When Upagupta passed into extinction, the tallies in the chamber were cremated with him.’”