往昔慈力王行十善，鬼神無食，以人皆持戒，時五夜叉來見王，王以身血施，令飽滿，而願若我當來成佛時，令汝得法食，且先度。慈力王即今釋迦牟尼佛，五夜叉即今五俱倫也。見賢愚經二，慈力王血施緣品。梵Maitrabala。
Maitrībala-rāja, king of merciful virtue, or power, a former incarnation of the Buddha when, as all his people had embraced the vegetarian life, and yakṣas had no animal food and were suffering, the king fed five of them with his own blood.
一慈力王 慈力，梵名 Maitrī-bala，巴利名 Metti-bala。音譯彌羅拔羅、彌佉拔羅。即釋迦牟尼佛於因位修菩薩行時之王名。過去世閻浮提有一慈力王，力行十善，人民皆持戒，三業清淨，故鬼神無以為食。時五夜叉不堪饑渴，遂來見王，王以身血施之，令得飽滿，並發一願，謂當來成佛時，必先度彼等，令彼等皆得法食。慈力王即釋迦牟尼佛之前身，五夜叉即憍陳如等五比丘。據大唐西域記卷二載，烏仗那國之盧醯呾迦塔，即為此一菩薩行之遺址。〔賢愚經卷二慈力王血施緣品、菩薩本生鬘論卷三〕p7283