俱舍論頌疏論本 20.36

20.36

自界三色一，無漏識所行者，此上欲界所繫苦、集、修斷各五識緣，謂自界三及色界一，並無漏識，名為五識。自界三者，即如前說苦、集、修也。及色界一者，謂修所斷，以色界修斷得緣欲界苦集修也。無漏識者，謂無漏識亦緣欲界苦集修也。

As for 'Are the domain of three of their own realm, one of the form realm, and pure consciousness': what are bound to the desire realm and abandoned by suffering, origin, and cultivation are each taken as an object by five consciousnesses; namely, three of their own realm, one of the form realm, along with pure consciousness, which are termed the five consciousnesses. 'Three of their own realm' refers to [those abandoned by seeing] suffering, origin, and cultivation as stated above. 'One of the form realm' refers to what is abandoned by cultivation, because what is abandoned by cultivation in the form realm can take the suffering, origin, and cultivation of the desire realm as an object. 'Pure consciousness' means that uncontaminated consciousness also takes the suffering, origin, and cultivation of the desire realm as an object.