an.5.129 Aṅguttara Nikāya (Numbered Discourses)

“There are these five inhabitants of the states of deprivation, inhabitants of hell, who are in agony & incurable. Which five? One who has killed his/her mother, one who has killed his/her father, one who has killed an arahant, one who—with a corrupted mind—has caused the blood of a Tathagata to flow, and one who has caused a split in the Sangha. These are the five inhabitants of the states of deprivation, inhabitants of hell, who are in agony & incurable.”