An evil man named Ajita lived in the Bārāṇasī Palace. He fell in love with his mother, killed his father and then took her as his wife. When an arhat who had been his father’s teacher reprimanded Ajita for his sin, he killed that arhat. Furthermore, when his mother married another man, Ajita also killed her. Thus Ajita committed all the three rebellious sins of killing his own father, mother, and an arhat. Unable to bear the rejection and denunciation of his neighbors, Ajita went to the Jeta Grove Monastery and begged to become a monk. When the monks there refused his request to enter the priesthood, Ajita burnt down their dwellings in a burst of anger. However, after meeting Śākyamuni Buddha and repenting for the transgressions committed in the past he was finally allowed to become a monk.

Kōnichi-bō Gosho, A Letter to Nun Kōnichi, Writings of Nichiren Shōnin, Biography and Disciples, Volume 5, Pages 52