勅修百丈清規 5.40

5.40

梵云尼師壇。此云隨坐衣。根本毘柰耶云。尼師但那唐言坐具。五分律云為護身護衣護僧床褥故。蓄坐具。僧祇云。律應量作長佛二磔手。廣一磔手半（佛一磔手長二尺四寸。此合長四尺八寸。廣三尺六寸）。

In Sanskrit it is called niṣīdana; here it is called 'garment to sit upon as needed.' The Mūlasarvāstivāda Vinaya says: 'Niṣīdana in the language of Tang is zuoju (sitting mat).' The Mahīśāsaka Vinaya says: 'For the sake of protecting the body, protecting the robes, and protecting the Sangha's beds and mats, one keeps a niṣīdana.' The Mahāsaṃghika Vinaya says: 'According to the vinaya, it should be made to measure: two Buddha hand-spans in length, and one and a half spans in width.' (One Buddha hand-span is two chi and four cun long; this should be four chi and eight cun long, and three chi and six cun wide).