The Long Āgama Sūtra 13.73

13.73

「阿難！復有八解脫。云何八？色觀色，初解脫。內無色想，觀外色，二解脫。淨解脫，三解脫。度色想，滅有對想，不念雜想，住空處，四解脫。度空處，住識處，五解脫。度識處，住不用處，六解脫。度不用處，住有想無想處，七解脫。滅盡定，八解脫。阿難！諸比丘於此八解脫，逆順遊行，入出自在，如是比丘得俱解脫。」

“Ānanda, there are also eight liberations. What are the eight? Form observed as form is the first liberation. Observing form externally without an internal perception of form is the second liberation. The liberation of purity is the third liberation. Going beyond notions of form, ceasing notions of resistance, not attending to diverse notions, and abiding in the abode of space is the fourth liberation. Going beyond the abode of space and abiding in the abode of consciousness is the fifth liberation. Going beyond the abode of consciousness and abiding in the abode of nothingness is the sixth liberation. Going beyond the abode of nothingness and abiding in the abode of with and without conception is the seventh liberation. The samādhi of complete cessation is the eighth liberation.

“Ānanda, monks who traverse these eight liberations forward and backward, entering and exiting them at will, are monks who’ve attained liberation in both ways.”