俱舍論頌疏論本 24.37

24.37

釋曰：由雜修第四靜慮有五品故，淨居唯五：一下品、二中品、三上品、四上勝品、五上極品。初品有三，謂三心也，初起一無漏，次起一有漏，後起一無漏。第二品六，謂更三心并前成六。第三品九，謂更三心并前成九。第四品十二，謂更三心并前九心故成十二。第五品十五，復起三心并前十二故成十五。如是五品，如其次第感五淨居。應知此中無漏勢力熏修有漏，令感淨居，非是無漏能感淨居，憎背有故。

The explanation says: Because the mixed cultivation of the fourth dhyāna has five grades, the Śuddhāvāsa heavens are only five: 1. inferior grade, 2. middling grade, 3. superior grade, 4. higher-superior grade, and 5. supreme grade. The first grade has three—that is, three mind-moments: first arises one uncontaminated, next arises one contaminated, and finally arises one uncontaminated. The second grade has six—that is, three more mind-moments added to the previous ones make six. The third grade has nine—that is, three more mind-moments added to the previous ones make nine. The fourth grade has twelve—that is, three more mind-moments added to the previous nine minds make twelve. The fifth grade has fifteen—again three mind-moments arise, which added to the previous twelve make fifteen. These five grades, in their respective order, karmically induce rebirth in the five Śuddhāvāsa heavens. It should be understood that here the force of the uncontaminated perfumed and cultivated the contaminated, causing it to karmically induce rebirth in the Śuddhāvāsa heavens; it is not that the uncontaminated itself can karmically induce rebirth in the Śuddhāvāsa heavens, because it detests and turns away from existence.