Full Idea
Zeno's third argument claims that a moving arrow is still. Here the conclusion depends on assuming that time is composed of nows; if this assumption is not granted, the argument fails.
Gist of Idea
Zeno's arrow paradox depends on the assumption that time is composed of nows
Source
comment on Zeno (Elea) (fragments/reports [c.450 BCE], A27?) by Aristotle - Physics 239b5
Book Reference
'The First Philosophers', ed/tr. Waterfield,Robin [OUP 2000], p.76