律戒本疏 1.32

1.32

十一縞絁耶作敷具　縞絁耶綿也。數具房中敷地縟也。俱舍毘國比丘取綿作縟。一以綿貴。二以多害虫。四輩譏嫌。因是結戒。將以害生無慈故。難治妨業故。奢貴非法故。若人為作。若是幣故得受用。

Eleventh: Making a spread of kauśeya. Kauśeya is silk floss. A spread is a mattress spread upon the ground in a room. Monks in the country of Kauśāmbī took silk floss to make mattresses: first, because floss is expensive; second, because it harms many silkworms. The four assemblies criticized and disparaged them. On this account, the precept was formulated: because it harms living beings and lacks compassion; because it is difficult to maintain and hinders one's practice; and because it is extravagant, expensive, and unlawful. If someone else makes it for him, or if it is tattered and old, he is permitted to receive and use it.