Five rebellious acts or sins
five rebellious acts or sins (五逆).
(3) killing an Arhat,
(4) shedding the blood of a Buddha (including maligning His Dharma), and
(5) destroying the harmony of a Saṅgha.
They are also called the karma of the five no interruptions because any of them drives one into Avīci Hell, the hell of the five no interruptions.