菩薩瓔珞本業經 2.34

2.34

「佛子！是故菩薩無生觀，捨三界報變易果，用入中忍無相慧。出有入無化現無常，自見己身當果、諸佛摩頂說法，身心別行不可思議，故名不動地。

"O Son of the Buddha! Therefore, with the contemplation of non-arising, the bodhisattva abandons the retribution of the three realms and the fruit of transformation, entering the signless wisdom of intermediate forbearance. Emerging from existence and entering non-existence, manifesting impermanence, seeing one's own body's future fruit, having one's crown rubbed and the Dharma expounded by the Buddhas, body and mind engaging in inconceivable distinct acts, it is therefore called the Acalā-bhūmi.