Puggalapannatti 2.2.2.6

2.2.2.6

Yassa puggalassa ayaṃ upanāho appahīno—

First (comes) anger, after that (comes) vengeance. That which is vengeance as this is, the act of revenging and the state of being vengeful, the fixing, settling, establishing, grounding and following up, the violent act of anger is called vengeance. He whose vengeance remains unremoved is said to be vengeful.