Bhagavad Gita 1.31

निमित्तानि च पश्यामि विपरीतानि केशव |
न च श्रेयोऽनुपश्यामि हत्वा स्वजनमहवे

Translation

O Krishna, killer of the Keshi demon, I only see omens of misfortune. I do not foresee how any good can come from killing my own kinsmen in this battle.