(I shall describe the story of the brothers, Tapussa and Bhallika, based on the Commentary on the Aṅguttara Nikǎya and the Commentary on the Theragǎthǎ, the Ekaka nipǎta.)
he future Tapussa and future Bhallika were reborn into a worthy family in the city of HaÑsǎvatī, during the time of Buddha Padumuttara. When they were listening to a discourse by the Buddha, they saw two disciples being named as the foremost in being the first of the Buddha's disciples who were established in the Three Refuges. The two brothers aspired to that distinction and after making an extraordinary offering to the Buddha, they
wished for that goal. (Aṅguttara Commentary)