Chapter 4, Verse 1
Part of 4: Jñāna Karm Sanyās Yog — ज्ञानकर्मसंन्यासयोगश्री भगवानुवाच इमं विवस्वते योगं प्रोक्तवानहमव्ययम्। विवस्वान् मनवे प्राह मनुरिक्ष्वाकवेऽब्रवीत्॥
śhrī bhagavān uvācha imaṁ vivasvate yogaṁ proktavān aham avyayam vivasvān manave prāha manur ikṣhvākave ’bravīt
The Blessed Lord said, "I taught this imperishable Yoga to Vivasvan; he then told it to Manu; Manu proclaimed it to Ikshvaku.
Vivasvan means the sun. Ikshvaku was the son of Manu. Ikshvaku was the reputed ancestor of the solar dynasty of Kshatriyas. This Yoga is said to be imperishable because the result or fruit, i.e.? Moksha, that can be attained through it is imperishable. If the rulers of dominions possess a knowledge of the Yoga taught by Me in the preceding two discourses, they can protect the Brahmanas and rule their kingdom with justice. So I taught this Yoga to the Sungod in the beginning of evolution.