Bhagavad Gita 9.24
I am the willing recipient of sacrifice, and I am its true Lord. But they do not know me truly, so they fall back.
अहं हि सर्वयज्ञानां भोक्ता च प्रभुरेव च।
न तु मामभिजानन्ति तत्त्वेनातश्च्यवन्ति ते॥ahaṃ hi sarvayajñānāṃ bhoktā ca prabhureva ca|
na tu māmabhijānanti tattvenātaścyavanti te||
English translation (above): Shri Purohit Swami (1935), public domain. Sanskrit text via github.com/gita/gita (Unlicense).