Chapter 4 · Knowledge and Renunciation of Action · Arjuna said
Bhagavad Gita 4.4 — Arjuna's doubt
अर्जुन उवाच। अपरं भवतो जन्म परं जन्म विवस्वतः। कथमेतद्विजानीयां त्वमादौ प्रोक्तवानिति ॥
arjuna uvāca | aparaṃ bhavato janma paraṃ janma vivasvataḥ | kathametadvijānīyāṃ tvamādau proktavāniti ||
Meaning
Arjuna said: You were born recently, and Vivasvan was born long ago. How am I to understand that you taught it to him in the beginning?