One verse

Bhagavad Gita 1.36

1.36

निहत्य धार्तराष्ट्रान्नः का प्रीतिः स्याज्जनार्दन | पापमेवाश्रयेदस्मान्हत्वैतानाततायिनः ||१-३६||

nihatya dhārtarāṣṭrānnaḥ kā prītiḥ syājjanārdana . pāpamevāśrayedasmānhatvaitānātatāyinaḥ ||1-36||

nihatya
by killing
dhārtarāṣṭrān
the sons of Dhṛtarāṣṭra
naḥ
our
kā
what
prītiḥ
pleasure
syāt
will there be
janārdana
O maintainer of all living entities
pāpam
vices
eva
certainly
āśrayet
must come upon
asmān
us
hatvā
by killing
etān
all these
ātatāyinaḥ
aggressors

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?