佛說佛名經 19.6

19.6

「復有第四人，取彼若干微塵數世界。若著微塵及不著者，下至水際、上至有頂滿中微塵。舍利弗！於意云何？彼諸微塵可知數不？」

"Suppose there is a fourth person who takes worlds as numerous as that number of dust motes; whether a dust mote was deposited or not, down to the water limit and up to the pinnacle of existence, they are filled with fine dust motes. Śāriputra! What do you think? Could the number of all those dust motes be known?"