37 prove it to me in this way. I will put a wool fleece on the threshing floor tonight. If the fleece is wet with dew in the morning but the ground is dry, then I will know that you are going to help me rescue Israel as you promised." 38 And that is just what happened. When Gideon got up early the next morning, he squeezed the fleece and wrung out a whole bowlful of water. 39 Then Gideon said to God, "Please don't be angry with me, but let me make one more request. Let me use the fleece for one more test. This time let the fleece remain dry while the ground around it is wet with dew." 40 So that night God did as Gideon asked. The fleece was dry in the morning, but the ground was covered 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.