Vishnupurana 1.1.20

1.1.20

alaṃ niśācarair dagdhair dīnair anaparādhibhiḥ
satraṃ te viramatv etat kṣamāsārā hi sādhavaḥ //

Paráśara replied, Well inquired, pious Maitreya. You recall to my recollection that which was of old narrated by my father's father, Vaśisht́ha. I had heard that my father had been devoured by a Rákshas employed by Viswámitra: violent anger seized me, and I commenced a sacrifice for the destruction of the Rákshasas: hundreds of them were reduced to ashes by the rite, when, as they were about to be entirely extirpated, my grandfather Vaśisht́ha thus spake to me: Enough, my child; let thy wrath be appeased: the Rákshasas are not culpable: thy father's death was the work of destiny. Anger is the passion of fools; it becometh not a wise man. By whom, it may be asked, is any one killed? Every man reaps the consequences of his own acts. Anger, my son, is the destruction of all that man obtains by arduous exertions, of fame, and of devout austerities; and prevents the attainment of heaven or of emancipation. The chief sages always shun wrath: he not thou, my child, subject to its influence. Let no more of these unoffending spirits of darkness be consumed. Mercy is the might of the righteous.