釋氏要覽 3.170

3.170

今僧止所住處。名掛錫者。凡西天比丘。行必持錫杖。持錫有二十五威儀。凡至室中。不得著地。必掛於壁牙上。故云掛錫。

Nowadays, when a monk stays at a dwelling place, it is called "hanging the staff". Whenever an Indian bhikṣu travels, he must carry a pewter staff (khakkhara). Carrying the staff has twenty-five deportments. Whenever he reaches a room, it must not touch the ground, but must be hung upon a wall hook. Hence it is called hanging the staff.