俱舍論疏 24.84

24.84

論「此中初品至第五品十五」，明成品也。一念無漏、一念有漏、一念無漏，此之三心初成滿時名為下品，重起三心名第二品，更起三心成第三品，四遍五遍重起三心名第四品、第五品也。即是熏修力漸勝義。由此初三、二六、三九，四有十二，五十五也。

The passage of the treatise starting with "Herein, the first grade... the fifth grade has fifteen" clarifies the completion of the grades. One thought-moment uncontaminated, one thought-moment contaminated, and one thought-moment uncontaminated: when these three minds are initially perfected, it is called the lower grade. Arising the three minds again is called the second grade; arising the three minds once more forms the third grade; arising the three minds four times or five times repeatedly is called the fourth grade and the fifth grade. This is the meaning of the power of perfuming cultivation gradually increasing. Due to this, the first has three, the second six, the third nine, the fourth has twelve, and the fifth fifteen.