四分律行事鈔資持記 2.814

2.814

明懺中。此戒不對僧捨，恐隨別悔，故特遮之。以過重故。

In explaining repentance: in this precept, one does not forfeit before the Saṃgha; fearing that one might confess separately, it specifically bars this, because the fault is grave.