Bhagavad Gita · 12.3

ये त्वक्षरमनिर्देश्यमव्यक्तं पर्युपासते।सर्वत्रगमचिन्त्यं च कूटस्थमचलं ध्रुवम्॥

ye tv akṣharam anirdeśhyam avyaktaṁ paryupāsate sarvatra-gam achintyaṁ cha kūṭa-stham achalaṁ dhruvam

But those who worship the imperishable, indefinable, unmanifest, all-pervading, inconceivable, unchanging, immovable, and eternal —

— Bhagavad Gita 12.3

Source: Sacred-Texts.com (Sanskrit) + Bhagavad-Gita.io (translations)