俱舍論記 24.87

24.87

「且於一處至九百六十」者，答。諸離下地九品染者，即說名為上地具縛。為成四靜慮，一一地離染九數皆等故、以斷下地第九品染不生下故，故斷第九為上具縛。斷下地第九并上地前八品即成九品，故名離染九數等也。餘文例釋。總結可知。

[The phrase] "In just one abode […] nine hundred and sixty" is the reply. Those who are free from the nine grades of defilement of a lower stage are called those with all bonds in the upper stage. To complete the four dhyānas, each stage's nine counts of freedom from passion are all equal; because by abandoning the ninth grade of defilement of a lower stage one is not reborn in the lower [stage], abandoning the ninth makes one fully bound in the upper [stage]. Abandoning the ninth of the lower stage together with the prior eight grades of the upper stage constitutes nine grades, and thus it is said that "the nine counts of freedom from passion are equal." The remaining text is explained accordingly. The overall conclusion can be known from this.