俱舍論記 14.91

14.91

「雖無對師至故不立有」者，答。盡形惡戒雖無對師，壞善過重得不律儀；非暫壞善，以無對師故令得惡戒，故無晝夜。然近住戒由對師力，雖壞惡輕而得律儀。假設有人對師暫受不律儀者亦必應得，然未曾見，故不立有。

"Although not before a preceptor... therefore it is not established to exist" is the reply. Although evil precepts for the duration of life are not before a preceptor, because the destruction of good is extremely grave, one obtains non-restraint; but for a temporary destruction of good, since there is no preceptor, one is not caused to obtain evil precepts, so there is no [non-restraint for] a day and night. However, the fasting precepts (upoṣadha / upavāsa), due to the power of a preceptor, yield restraint even though the destruction of evil is slight. If someone were to take non-restraint temporarily before a preceptor, they would certainly obtain it too; however, this has never been seen, so it is not established to exist.