法苑珠林 25.8

25.8

Second, the treatise states: The reason why Uruvilvā-Kāśyapa is called foremost is that from past lives onward, the three brothers were always accompanied by one thousand disciples. Now encountering the Buddha, they achieved liberation and all attained arhatship. The four requisites of offerings arose from this, thus sustaining and protecting the holy assembly; hence he is the foremost among receivers of offerings.