On all the earth — That is, upon all that spot of ground which encompasses the fleece.
Related Commentaries of Judges 6:37
Judges 6:37
37 Behold, I will put a fleece of wool in the floor; and if the dew be on the fleece only, and it be dry upon all the earth beside, then shall I know that thou wilt save Israel by mine hand, as thou hast said.