俱舍論頌疏論本 18.5

18.5

三殺一誑語者，謂害父母、殺阿羅漢，名為三殺。破僧誑語，名一誑語。此四是根本業道也。

"Three are killing, one is deceitful speech": killing one's parents and killing an arhat are called the three killings. The deceitful speech that causes a schism in the Saṅgha is called the one deceitful speech. These four are fundamental courses of karma.