諸經要集 10.170

10.170

又集一切功德三昧經云。釋迦過去久遠。作五通仙人。名曰最勝。又依智度論云。釋迦文佛。本為菩薩時。名曰樂法。時世無佛。不聞善語。四方求法。精進不懈。了不能得。爾時魔變作婆羅門。而語之言。我有佛所說一偈。汝能以皮為紙。以骨為筆。以血為墨。書寫此偈。當以與汝。樂法即時自念。我世世喪身無數。不得是利即自剝皮暴之。令乾欲書其偈。魔便滅身。是時佛知其至心。即從下方踊出為說深法。即得無生法忍。

Furthermore, the Sarvapuṇyasamuccaya-samādhi-sūtra says: Long ago in the past, Śākyamuni was an ascetic endowed with the five supernormal powers, named Viśiṣṭa. Furthermore, according to the Mahāprajñāpāramitopadeśa: When the Buddha Śākyamuni was formerly a bodhisattva, his name was Dharmakāma. At that time there was no Buddha in the world, and good words could not be heard. He sought the Dharma in the four directions with unflagging diligence, but could not obtain it at all. At that time, Māra transformed himself into a brāhmaṇa and spoke to him, saying: "I have a verse spoken by a Buddha. If you can use your skin as paper, your bones as a pen, and your blood as ink to copy this verse, I will give it to you." Dharmakāma immediately thought to himself: "In lifetime after lifetime I have lost my body countlessly without gaining this benefit." He then flayed his own skin and exposed it to dry, wishing to write the verse. Māra then made his body vanish. At that time the Buddha, knowing his utmost sincerity, leapt forth from the realm below and expounded the profound Dharma for him, whereupon he immediately attained the endurance of the non-arising of dharmas.