俱舍論記 14.165

14.165

「頌曰至毀犯前戒」者，答。文可知。又《正理》三十八云「先娶妻妾後受律儀，於自妻等亦發此戒。以近事等別解脫律儀，一切有情處所得故。若異此者，於自妻、妾，非處、非時、非支、非禮，亦應不犯欲邪行戒。於舊所受既有犯者，於新所受應有不犯。

[On the phrase,] "The verse says: [...] transgress the former discipline": This is an answer. The text is understandable. Furthermore, Nyāyānusāra 38 states: "If one first marries a wife and concubines and later receives the discipline, this discipline also arises with respect to one's own wife and so forth. This is because the prātimokṣa disciplines of an upāsaka and so forth are obtained with respect to all sentient beings. If it were otherwise, then with respect to one's own wife and concubines, engaging in improper place, improper time, improper orifice, and improper conduct would also not violate the precept against sexual misconduct. Since there is a transgression with respect to what was previously undertaken, with respect to what is newly undertaken there should likewise not be no transgression."