佛說觀佛三昧海經 7.42

7.42

When these words were spoken, devas, nāgas, yakṣas, the eight classes of spirits, and an assembly of one billion two hundred million generated the aspiration for anuttarā samyaksaṃbodhi. They made a vow of their own: “May we in future ages always enter samādhi and behold the Buddha's rūpakāya just as it is now, without any difference.”