俱舍論疏 24.204

24.204

「論曰至依三界身」，明前三果唯依欲界九依身得，謂六欲天及三天下。第四果通依三界身，謂欲九依。色界十六依。無色四。總二十九依身，得阿羅漢果。

From “The treatise says ... up to ‘relying on the bodies of the three realms’”: this clarifies that the first three fruits are attained relying solely on the nine bases of the desire realm, namely the six desire heavens and the three continents. The fourth fruit is attained relying generally on the bodies of the three realms, namely the nine bases of desire, sixteen bases of the form realm, and four of the formless realm. Altogether, relying on twenty-nine bases, one attains the fruit of arhatship.