Bhagavad Gita 6.30

He who sees Me in everything and everything in Me, I shall never forsake him, nor shall he lose Me.

यो मां पश्यति सर्वत्र सर्वं च मयि पश्यति।
तस्याहं न प्रणश्यामि स च मे न प्रणश्यति॥

yo māṃ paśyati sarvatra sarvaṃ ca mayi paśyati|
tasyāhaṃ na praṇaśyāmi sa ca me na praṇaśyati||

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