One verse

Srimad Bhagavatam 9.15.41

9.15.41

राज्ञो मूर्धाभिषिक्तस्य वधो ब्रह्मवधाद् गुरु: । तीर्थसंसेवया चांहो जह्यङ्गाच्युतचेतन: ॥ ४१ ॥

rajno murdhabhisiktasya vadho brahma-vadhad guruh tirtha-samsevaya camho jahy angacyuta-cetanah

rajnah
of the king
murdha-abhisiktasya
who is noted as the emperor
vadhah
the killing
brahma-vadhat
than killing a brahmana
guruh
more severe
tirtha-samsevaya
by worshiping the holy places
ca
also
amhah
the sinful act
jahi
wash out
anga
O my dear son
acyuta-cetanah
being fully Krsna conscious.

My dear son, killing a king who is an emperor is more severely sinful than killing a brahmana. But now, if you become Krsna conscious and worship the holy places, you can atone for this great sin.