37 then look: I'm placing a fleece of wool on the threshing floor. If dew is on the fleece only, but the floor is dry, then I know that you will use me to save Israel, as you said." 38 That's what happened. When he got up early the next morning, he wrung out the fleece - enough dew to fill a bowl with water! 39 Then Gideon said to God, "Don't be impatient with me, but let me say one more thing. I want to try another time with the fleece. But this time let the fleece stay dry, while the dew drenches the ground." 40 God made it happen that very night. Only the fleece was dry while the ground was wet with dew.
Matthew Henry's Commentary on Judges 6:37-40
Commentary on Judges 6:33-40
(Read Judges 6:33-40)
These signs are truly miraculous, and very significant. Gideon and his men were going to fight the Midianites; could God distinguish between a small fleece of Israel, and the vast floor of Midian? Gideon is made to know that God could do so. Is Gideon desirous that the dew of Divine grace might come down upon himself in particular? He sees the fleece wet with dew to assure him of it. Does he desire that God will be as the dew to all Israel? Behold, all the ground is wet. What cause we sinners of the Gentiles have, to bless the Lord that the dew of heavenly blessings, once confined to Israel, is now sent to all the inhabitants of the earth! Yet still the means of grace are in different measures, according to the purposes of God. In the same congregation, one man's soul is like Gideon's moistened fleece, another like the dry ground.