Garudapurana 3.3.39

3.3.39

parā (māṇū)nāṃ lakṣaṇaṃ veditavyaṃ jñānecchubhirnānyathā veditavyam /
padārthānāṃ pārthivānāṃ khagendra viśeṣāṇāṃ caramākhyo viśeṣaḥ //

The characteristic of ultimate atoms must be known by those who desire knowledge, and it must not be understood otherwise. / Of earthly substances, O King of Birds, of distinctions, it is the ultimate distinction;