Bhagavad Gita 12.3

Those who worship Me as the Indestructible, the Undefinable, the Omnipresent, the Unthinkable, the Primal, the Immutable, and the Eternal;

ये त्वक्षरमनिर्देश्यमव्यक्तं पर्युपासते।सर्वत्रगमचिन्त्यं च कूटस्थमचलं ध्रुवम्॥

ye tvakṣaramanirdeśyamavyaktaṃ paryupāsate|sarvatragamacintyaṃ ca kūṭasthamacalaṃ dhruvam||

English translation (above): Shri Purohit Swami (1935), public domain. Sanskrit text via github.com/gita/gita (Unlicense).