大般涅槃經集解 26.21

26.21

案僧宗曰：第八借以身力推比，佛必無有病，仍說偈以勸也。智秀曰：此七復次是第一翻，推佛不應病也。

Sengzong notes: The eighth borrows physical strength to infer and compare, showing that the Buddha must have no illness, and then speaks verses to encourage him. Zhixiu says: These seven repetitions are the first round, inferring that the Buddha ought not to be ill.