One verse

Srimad Bhagavatam 1.8.50

1.8.50

नैनो राज्ञ: प्रजाभर्तुर्धर्मयुद्धे वधो द्विषाम् । इति मे न तु बोधाय कल्पते शासनं वच: ॥ ५० ॥

naino rajnah praja-bhartur dharma-yuddhe vadho dvisam iti me na tu bodhaya kalpate sasanam vacah

na
never
enah
sins
rajnah
of the king
praja-bhartuh
of one who is engaged in the maintenance of the citizens
dharma
for the right cause
yuddhe
in the fight
vadhah
killing
dvisam
of the enemies
iti
all these
me
for me
na
never
tu
but
bodhaya
for satisfaction
kalpate
they are meant for administration
sasanam
injunction
vacah
words of.

There is no sin for a king who kills for the right cause, who is engaged in maintaining his citizens. But this injunction is not applicable to me.