One verse

Bhagavad Gita 1.37

1.37

तस्मान्नार्हा वयं हन्तुं धार्तराष्ट्रान्स्वबान्धवान् | स्वजनं हि कथं हत्वा सुखिनः स्याम माधव ||१-३७||

tasmānnārhā vayaṃ hantuṃ dhārtarāṣṭrānsvabāndhavān . svajanaṃ hi kathaṃ hatvā sukhinaḥ syāma mādhava ||1-37||

tasmāt
therefore
na
never
arhāḥ
deserving
vayam
we
hantum
to kill
dhārtarāṣṭrān
the sons of Dhṛtarāṣṭra
sa-bāndhavān
along with friends
sva-janam
kinsmen
hi
certainly
katham
how
hatvā
by killing
sukhinaḥ
happy
syāma
will we become
mādhava
O Kṛṣṇa, husband of the goddess of fortune

Sin will overcome us if we slay such aggressors. Therefore it is not proper for us to kill the sons of Dhṛtarāṣṭra and our friends. What should we gain, O Kṛṣṇa, husband of the goddess of fortune, and how could we be happy by killing our own kinsmen?