四分律行事鈔資持記 1.1227

1.1227

開中。隨身安者，亦須坐草，但不具儀耳；故律云：時有病比丘，偏袒脫屣，互跪合掌，時久病增；白佛因開。注中云訖自恣者，謂自陳三說竟也。非謂合眾都訖，上云：隨訖復座，豈不明耶！

In the exceptions: 'according to the body's comfort' also requires sitting on grass, but without full formality; thus the Vinaya states: 'At that time there was a sick bhikṣu who bared one shoulder, took off his sandals, knelt, and joined his palms; as time passed, his illness worsened; he reported it to the Buddha, who consequently made an exception.' In the note, 'having finished pravāraṇā' refers to finishing one's own threefold declaration. It does not mean that the whole assembly has entirely finished; above it says 'returning to the seat upon finishing'—how could this not be clear!