佛說觀佛三昧海經 9.26

9.26

At that time, countless Buddhas appeared in the sky, all manifesting light. The transformation Buddhas that emerged from every single pore of their bodies were like Śākyamuni. They all addressed Ānanda, saying: "Son of the Dharma! Now hold this buddhānusmṛti-samādhi and explain it extensively for the great assembly, causing ordinary beings to plant the cause for seeing the Buddha." Having spoken these words, the transformation Buddhas disappeared.