Kings greedy for sense gratification on this earth almost always kill their enemies indiscriminately. To satisfy their own whims, they may kill anyone, even their mothers, fathers, brothers or friends.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
मातरं पितरं भ्रातॄन् सर्वांश्च सुहृदस्तथा । घ्नन्ति ह्यसुतृपो लुब्धा राजानः प्रायशो भुवि
mātaraṃ pitaraṃ bhrātṝn sarvāṃśca suhṛdastathā | ghnanti hyasutṛpo lubdhā rājānaḥ prāyaśo bhuvi
SB 10.1.67