四分律行事鈔資持記 2.304

2.304

次《十誦》及下《善生》，並是顯文。佛圖，即全梵語；或召塔者，亦以藏佛遺身，從人為目。

Next, the Daśādhyāya-vinaya and the Upāsakaśīla-sūtra below are both explicit texts. "Fútú" is the full Sanskrit term (buddha / thūpa); calling it a stupa is also because it enshrines the Buddha's relic-body, taking its name from the person.