Udana quotes

 “There is that dimension, monks, where there is neither earth, nor water, nor fire, nor wind; neither dimension of the infinitude of space, nor dimension of the infinitude of consciousness, nor dimension of nothingness, nor dimension of neither perception nor non-perception; neither this world, nor the next world, nor sun, nor moon. And there, I say, there is neither coming, nor going, nor staying; neither passing away nor arising: unestablished, unevolving, without support [mental object]. This, just this, is the end of stress.” — Ud 8:1

“There is, monks, an unborn—unbecome—unmade—unfabricated. If there were not that unborn—unbecome—unmade—unfabricated, there would not be the case that escape from the born—become—made—fabricated would be discerned. But precisely because there is an unborn—unbecome—unmade—unfabricated, escape from the born—become—made—fabricated is discerned.” — Ud 8:3