三彌勒經疏 1.180

1.180

經曰「摩竭國」以下，第二迦葉領衣入山。彼山者，即耆闍崛山。又有經狼迹山者，猶是崛山少分也。若《智度論》第三十五云「大迦葉入王舍城乞食，食已未久登雞足山。山有三岑，如仰雞足，尊者入中結趺坐。作誠言：『願我此身納鉢杖久住不壞，乃至經五十七億俱胝六十百千年慈氏正等覺出世時，施作佛事。』發此願已尋般涅槃。時彼三岑便會成一，掩弊尊者巖」也。

From the sūtra saying "Magadha..." onward is the second part, Kāśyapa taking the robe and entering the mountain. That mountain is Mount Gṛdhrakūṭa. Another sūtra calls it Mount Kukkuṭapāda, which is still a small part of Mount Gṛdhrakūṭa. As the Da zhidu lun, fascicle thirty-five, says: "Mahākāśyapa entered the city of Rājagṛha to beg for food. Having eaten, shortly thereafter he climbed Mount Kukkuṭapāda. The mountain has three peaks, like an upturned cock's foot. The Venerable One entered between them and sat cross-legged. He made a vow of truth: 'May this body of mine, along with patched robe, bowl, and staff, remain for a long time without decaying, until after fifty-seven koṭis and sixty hundred thousand years have passed, when Maitreya, the Samyaksaṃbuddha, appears in the world, to perform the Buddha's work.' Having made this vow, he soon entered parinirvāṇa. At that time, those three peaks joined into one, enclosing the Venerable One's cliff."