四分律行事鈔資持記 1.302

1.302

三舉中。比丘犯罪，拒云不見，或不肯懺，或說婬欲不障道，名惡邪不捨。此三並白四法舉棄眾外，如物無用，故名三舉。下句指廣，尋之自見。

Regarding the 'three expulsions': a bhikṣu commits an offense, and stubbornly says he does not see it, or refuses to confess, or says that sexual desire does not obstruct the Path, which is called not relinquishing an evil heresy. These three are all subjected to the jñapticaturthā karmavācanā to be expelled and cast outside the assembly, like an object rendered useless; hence they are called the 'three expulsions.' The lower sentence points to the broader treatment; consulting it, this will become clear of itself.