大般涅槃經疏 13.15

13.15

「爾時世尊」下，第二如來結成，又三：一授記、二付囑、三現病。舊云：從付囑下便為〈現病品〉。今則不然，現病為結成前，在此無妨也。背痛者，出《大智論》，昔鹿王為後來跛兔忍死待之，今佛為須跋故背痛也。

From "At that time the World-Honored One" onward is the second [part], the Tathāgata's conclusion, which also has three [parts]: (1) conferring predictions, (2) entrustment, and (3) manifesting illness. An older view states: From entrustment onward constitutes the "Chapter on Manifesting Illness." Now, however, it is not so: manifesting illness serves to conclude the preceding, so there is no harm in its being here. Back pain: this derives from the Da zhidu lun, where formerly the Deer King, for the sake of a late-coming lame hare, endured death and awaited it; now the Buddha has back pain for the sake of Subhadra.