注大乘入楞伽經 4.147

4.147

以更不受生相續故涅槃不死，以非有為生住滅法故涅槃不壞，以無壞無死故，為修行者之所歸趣。

Because it does not receive birth in continuation any more, nirvāṇa does not die; because it is not a conditioned phenomenon of arising, abiding, and ceasing, nirvāṇa is indestructible. Being indestructible and deathless, it is that to which practitioners turn.