behold, I will put a fleece of wool on the threshing floor; if there be dew on the fleece only, and it be dry on all the ground, then shall I know that you will save Israel by my hand, as you have spoken.
and it be dry upon all the earth beside; meaning not upon all the world, nor even upon all the land of Israel, but upon all the floor about the fleece: then shall I know that thou wilt save Israel by my hand, as thou hast said; for the dew being a token of divine favour, see Hosea 14:5 it would show that Gideon would partake of it, while his enemies would be dry and desolate, and ruin and destruction would be their portion.