諸經要集 16.84

16.84

又智度論云。昔野火燒林。林中有一雉。勤身自力。飛來入水以水灑林。往反疲乏不以為苦。時天帝釋。來問之言。汝作何等。答曰。我救此林。愍眾生故。此林蔭育處居日久。清涼快樂。我諸種類。及諸宗親皆悉依仰。我有身力云何不救。天帝問言。汝乃精勤當至幾時。雉言以死為期。天帝言。誰為汝證。即自立誓。我心至誠。信不虛者願火即自滅。是時淨居天。知雉弘誓即為滅火。始終常茂。不為火燒（故經云人有善願天必從之斯言驗矣）。

Furthermore, the Mahāprajñāpāramitopadeśa states: In the past, a wildfire burned a forest. In the forest there was a pheasant that made earnest efforts with its own strength, flying to enter the water and sprinkling the water upon the forest. Going back and forth until exhausted, it did not consider it suffering. At that time, Śakra, the King of Gods, came and questioned it, saying: 'What are you doing?' It answered, saying: 'I am rescuing this forest because I take pity on sentient beings. This forest has shaded and nourished us, serving as a dwelling for a long time, cool and joyful. My kind and all my kin all rely on it. I have physical strength; why should I not rescue it?' The King of Gods asked, saying: 'You are so assiduous; until when will this last?' The pheasant said: 'Until death is my limit.' The King of Gods said: 'Who will bear witness for you?' It immediately made a vow: 'My mind is utterly sincere. If my faith is not false, may the fire extinguish of itself.' At that time, the gods of the Pure Abodes (Śuddhāvāsa) knew the pheasant's vast vow and immediately extinguished the fire for it. From beginning to end it remained evergreen and was not burned by fire. (Therefore the sūtra says: 'When a person has a good vow, Heaven will certainly comply with it.' These words are indeed verified.)