One verse

Srimad Bhagavatam 9.15.38

9.15.38

राम राम महाबाहो भवान् पापमकारषीत् । अवधीन्नरदेवं यत्सर्वदेवमयं वृथा ॥ ३८ ॥

rama rama mahabaho bhavan papam akarasit avadhin naradevam yat sarva-devamayam vrtha

rama rama
my dear son Parasurama
mahabaho
O great hero
bhavan
you
papam
sinful activities
akarasit
have executed
avadhit
have killed
naradevam
the king
yat
who is
sarva-deva-mayam
the embodiment of all the demigods
vrtha
unnecessarily.

O great hero, my dear son Parasurama, you have unnecessarily killed the king, who is supposed to be the embodiment of all the demigods. Thus you have committed a sin.