法苑珠林 19.9

19.9

又佛本行經云。輸頭檀王與諸眷屬百官。次第禮佛已。佛言。王今可禮優波離比丘等諸比丘。王聞佛教即從座起。頂禮五百比丘諸出家者。次第而禮。

The Sūtra of the Buddha's Former Deeds also states: "After King Śuddhodana, together with his retinue and the hundred officials, had prostrated to the Buddha in sequence, the Buddha said: 'The King may now prostrate to the bhikṣu Upāli and the other bhikṣus.' Hearing the Buddha's instruction, the King arose from his seat and prostrated with his head to the feet of the five hundred bhikṣus and all the renunciants, bowing to them in sequence."