天台菩薩戒疏 1.27

1.27

「如是」下，第三、結。初句結迹身，次句結本身，明千釋迦及千箇百億釋迦並以舍那為本，故云「如是」等。

From "thus" downward is the third part, the conclusion. The first phrase concludes the trace bodies, and the next phrase concludes the origin body, clarifying that the thousand Śākyamunis and the thousand times hundreds of millions of Śākyamunis all take Rocana as their origin; hence it says "thus," and so on.