Bhagavad Gita 18.75
Through the blessing of the sage Vyasa, I heard this secret and noble science from the lips of its Master, Lord Shri Krishna.
व्यासप्रसादाच्छ्रुतवानेतद्गुह्यमहं परम्।योगं योगेश्वरात्कृष्णात्साक्षात्कथयतः स्वयम्॥vyāsaprasādācchrutavānetadguhyamahaṃ param|yogaṃ yogeśvarātkṛṣṇātsākṣātkathayataḥ svayam||
English translation (above): Shri Purohit Swami (1935), public domain. Sanskrit text via github.com/gita/gita (Unlicense).