Leucippus

“The void is a not-being, and no part of what is is a not-being; for what is in the strict sense of the term is an absolute plenum. This plenum, however, is not one; on the contrary, it is a many infinite in number and invisible owing to the minuteness of their bulk.
The many move in the void (for there is a void): and by coming together they produce comingto-be, while by separating they pro-duce passing-away. Moreover, they act and suffer action whenever they chance to be in contact (for there they are not one), and they generate by being put together and becoming intertwined.
From the genuinely one, on the other hand, there could never have come to be a multiplicity,
nor from the genuinely many a one: that is impossible.”
― Leucippus