Bhagavad Gita 1.37

तस्मान्नार्हा वयं हन्तुं धार्तराष्ट्रान्स्वबान्धवान्।स्वजनं हि कथं हत्वा सुखिनः स्याम माधव ॥१.३७॥

tasmānnārhā vayaṃ hantuṃ dhārtarāṣṭrānsvabāndhavānsvajanaṃ hi kathaṃ hatvā sukhinaḥ syāma mādhava

Therefore, we should not kill the sons of Dhritarashtra, our relatives; for how can we be happy by killing our own kin, O Madhava (Krishna)?

गीता