俱舍論疏 30.114

30.114

論「謂於剎那至焰聲能行」，論主答也。即假相續雖剎那滅，從此至彼異處生時名之為行，因名行者，非謂實我從此至彼，猶如焰、聲雖念念滅，異處生故世說為行。

On the Śāstra's: "It means that at each moment ... a flame or sound can travel": The author of the Śāstra replies. That is, although the nominal continuum perishes from moment to moment, when it arises in a different location from here to there, this is called "walking"; the cause is called the "walker", not that a real self goes from here to there. Just as a flame or a sound, although perishing moment by moment, is conventionally said to travel because of arising in different locations.