Bhagavad Gita · 8.21

अव्यक्तोऽक्षर इत्युक्तस्तमाहुः परमां गतिम्।यं प्राप्य न निवर्तन्ते तद्धाम परमं मम॥

avyakto 'kṣhara ity uktas tam āhuḥ paramāṁ gatim yaṁ prāpya na nivartante tad dhāma paramaṁ mama

That unmanifest, known as the imperishable, is declared to be the supreme destination. Those who attain it never return. That is My supreme abode.

— Bhagavad Gita 8.21

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