2 Samuel 17:12

We will light upon him, as the dew falleth on the ground— This is very beautiful and expressive. The dew in Palestine, as in several other climates, falls fast and sudden, and is therefore no unapt emblem of an active expeditious soldiery. It was, perhaps, for this reason, that the Romans called their light-armed forces rorarii. The dew falls upon every spot of the earth; not a blade of grass escapes it. A numerous army resembles it in this respect; it is able to search every where.