Bhagavad Gita 4.4
अर्जुन उवाच। अपरं भवतो जन्म परं जन्म विवस्वतः। कथमेतद्विजानीयां त्वमादौ प्रोक्तवानिति।।4.4।।
arjuna uvāca| aparaṃ bhavato janma paraṃ janma vivasvataḥ| kathametadvijānīyāṃ tvamādau proktavāniti||4.4||
arjuna uvaca aparam bhavato janma param janma vivasvatah kathametadvijaniyam tvamadau proktavaniti4.4
Meaning
Arjuna raises a logical question: Krishna's birth was recent, while Vivasvan (the sun-god) was born at the beginning of creation. How could Krishna have taught this yoga in the beginning?
अर्जुन ने कहा — आपका जन्म अपर अर्थात् पश्चात का है और विवस्वान् का जन्म (आपके) पूर्व का है, इसलिये यह मैं कैसे जानूँ कि (सृष्टि के) आदि में आपने (इस योग को) कहा था?
This is verse 4 of 42 in Chapter 4 (Jnana Karma Sanyasa Yoga) of the Bhagavad Gita.