SB 11.16.7
jñatva jñati-vadham garhyam
adharmam rajya-hetukam
tato nivrtto hantaham
hato ’yam iti laukikah
Translation:
On the Battlefield of Kuruksetra Arjuna thought that killing his relatives would be an abominable, irreligious activity, motivated only by his desire to acquire a kingdom. He therefore desisted from the battle, thinking, “I would be the killer of my relatives. They would be destroyed.” Thus Arjuna was afflicted with mundane consciousness.
Purport:
Lord Krsna here explains to Uddhava the circumstances in which Sri Arjuna posed his questions.