菩薩從兜術天降神母胎說廣普經 1.78

1.78

「或有菩薩入捨三昧，遍滿北方無限無量阿僧祇恒河沙等剎眾生之類，恐彼眾生有缺漏行，將養擁護不令沒溺，取恒河沙中一沙，過恒河沙國土下一沙，如是盡恒河沙捨心不盡，皆是菩薩誓願堅固，即於胎中成無上道。

"Or there are bodhisattvas who enter the samādhi of equanimity, pervading the north throughout infinite, immeasurable, asankhyeya realms, equal to the sands of the Ganges, toward the categories of sentient beings, fearing that those sentient beings may have defective practices, nurturing and protecting them so they do not sink; taking one grain of sand from the sands of the Ganges, passing lands equal to the sands of the Ganges, and depositing one grain, in this way exhausting the sands of the Ganges, their mind of equanimity is not exhausted. These are all the firm vows of the bodhisattva, immediately accomplishing the unsurpassed Path within the womb.