俱舍論記 15.21

15.21

「若人不作至相似妙行」者，顯斯五定，由不遍故不得律儀，但得相似處中妙行。等，等取盜等。近住雖於時定，亦得律儀；此據盡形，故言不得。或一月等言，已遮晝夜五定，思之可知。若依經部，作此五定亦得律儀。

"If a person does not undertake […] a similar good action" shows that because these five limitations are not pervasive, one does not obtain restraint, but only obtains a similar, intermediate good action. "Etc." includes stealing and so forth. Although the upavāsa is limited in time, one also obtains restraint; here it is based on the end of life, and therefore it says one does not obtain it. Alternatively, the statement "for one month, etc." has already excluded the five limitations of day and night; this can be understood on reflection. If according to the Sautrāntikas, even if one makes these five limitations, one still obtains restraint.