俱舍論記 23.128

23.128

「彼從此後至所說如是」者，此下別釋七生。彼從此身得聖果已，後別於人中，極多結七中有、生有，天中亦然，四七總有二十八生。應言二十八，皆七等故，說極七生。如七處善，五蘊各七，五七應言有三十五，而言七處善者，以七同故，但言七也。七處善者，如前說。如七葉樹，西方有樹，枝枝之上皆有七葉。以實而言葉有無量，言七葉樹者，以七同故。毘婆沙師所說如是。結，謂結續不斷義也。或結謂煩惱，由結受七。

Regarding the passage [beginning with] "After this, he [...] thus it is explained": Below, this specifically explains the seven births. After attaining the noble fruit in this present body, subsequently in the human realm at most he experiences seven intermediate existences and seven rebirth existences, and likewise in the divine realm; the four sets of seven make twenty-eight births in total. One ought to say twenty-eight, but because each is equally seven, it is said that there are at most seven births. Just as with the seven bases of skillfulness, where each of the five aggregates has seven, and the five sets of seven ought to be called thirty-five, yet one says "the seven bases of skillfulness" because they are identical in being seven, so one merely says seven. The seven bases of skillfulness are as explained previously. It is also like the saptaparṇa tree: in the Western Regions there is a tree where every branch has seven leaves; in reality the leaves are countless, but it is called a seven-leaved tree because they are identical in being seven. Such is the explanation of the Vaibhāṣikas. "Experience" (jie) means linking and continuing without interruption. Alternatively, "knot" (jie) means the defilements, by which one undergoes seven [births].