Bhagavatapurana 5.11.12

5.11.12

kṣetrajña etā manaso vibhūtīr jīvasya māyā-racitasya nityāḥ /
āvirhitāḥ kvāpi tirohitāś ca śuddho vicaṣṭe hy aviśuddha-kartuḥ //

12. The Kshetragna (the intelligent principle, mere witness of all) looks on these various mental forms of the Jiva—environments instituted by Maya—forms as permanent, appearing in an endless current; sometimes manifest, i. e., during the waking and dreaming states (and sometimes unmanifest, i. e., during sleep); Kshetragna being pure and unaffected, while the mind is of impure activity, in not working towards Atman.