Bhagavad Gita 4.1
श्री भगवानुवाच। इमं विवस्वते योगं प्रोक्तवानहमव्ययम्। विवस्वान्मनवे प्राह मनुरिक्ष्वाकवेऽब्रवीत्।।4.1।।
śrī bhagavānuvāca| imaṃ vivasvate yogaṃ proktavānahamavyayam| vivasvānmanave prāha manurikṣvākave'bravīt||4.1||
shri bhagavanuvaca imam vivasvate yogam proktavanahamavyayam vivasvanmanave praha manurikshvakave'bravit4.1
Meaning
Krishna reveals that He originally taught this imperishable yoga to the sun-god Vivasvan, who taught it to Manu, and Manu taught it to Ikshvaku. This knowledge has an ancient divine lineage.
श्रीभगवान् बोले — मैंने इस अविनाशी योग को विवस्वान् (सूर्यदेव) को कहा; विवस्वान् ने मनु से कहा और मनु ने इक्ष्वाकु को बताया।
This is verse 1 of 42 in Chapter 4 (Jnana Karma Sanyasa Yoga) of the Bhagavad Gita.