Verse
व्यासप्रसादाच्छ्रुतवान् एतद्गुह्यमहं परम् ।योगं योगेश्वरात्कृष्णात् साक्षात्कथयतः स्वयम् ॥
vyāsaprasādācchrutavān etadguhyamahaṃ paramyogaṃ yogeśvarātkṛṣṇāt sākṣātkathayataḥ svayam
Through the grace of Vyasa I heard this supreme secret, this Yoga directly from Krishna, the divine Master of Yoga, who himself declared it.
Gītā 18·75