Bhagavad Gita Chapter 4, Verse 1

श्रीभगवानुवाच | इमं विवस्वते योगं प्रोक्तवानहमव्ययम् | विवस्वान्मनवे प्राह मनुरिक्ष्वाकवेऽब्रवीत् ||

śrī-bhagavān uvāca imaṁ vivasvate yogaṁ proktavān aham avyayam vivasvān manave prāha manur ikṣvākave 'bravīt

The Blessed Lord said: I taught this imperishable yoga to Vivasvan (the sun-god); Vivasvan taught it to Manu; and Manu imparted it to Ikshvaku.

Krishna reveals the ancient lineage of yoga teaching. 'Immortal yoga' (avyayam yoga) means this knowledge transcends time—it's not Krishna's invention but eternal wisdom. The teaching lineage shows: this wisdom has been passed down through generations, from the sun-god Vivasvan to human kings (Manu, Ikshvaku). This establishes the Gita's teaching as timeless, not personal opinion. Krishna is saying: 'This isn't new—it's ancient knowledge I'm revealing to you now.' Why does this matter? Because timeless wisdom carries more weight than contemporary advice. Arjuna isn't hearing a recent philosophy; he's receiving eternal truth.