A Mahāsāla brahmin, so called because he was tall in person and eminent in wealth (AA.ii.714). Having made preparations for a great sacrifice, in which numerous animals were to be slaughtered, he visited the Buddha at Jetavana to consult him as to the efficacy of the sacrifice. Three times he told the Buddha that he had heard that the laying down (ādhāna) of the fire and the setting up (ussāpana) of the sacrificial post bore great fruit. Three times the Buddha said that he had also heard this, and Uggatasarīra was about to conclude that the Buddha approved of his sacrifice, when Ānanda intervened, saying that the question was wrongly asked, and suggested that the Buddha should be asked to explain the meaning and to give advice as to the efficacy of the sacrifice, so Uggatasarīra then asked the Buddha to instruct him.
The Buddha thereupon declared that there were three fires to be cast off: lust (rāga), anger (dosa), and delusion (moha); and three fires that should be honoured: parents (āhuneyyaggi), wife and children (gahapataggi) and holy men and recluses (dakkhineyyaggi).
At the end of the discourse, Uggatasarīra declared himself to be a supporter, and set free the animals destined for the sacrifice.
See the Dutiya Aggi Sutta, Book of Sevens. A.iv.41‑6.