Bhagavad Gita Chapter 4.4
arjuna uvāca
aparaṁ bhavato janma
paraṁ janma vivasvataḥ
katham etad vijānīyāṁ
tvam ādau proktavān iti
Translation
Arjuna said: The sun-god Vivasvān is senior by birth to You. How am I to understand that in the beginning You instructed this science to him?