And God did so that night: for it was {q} dry upon the fleece only, and there was dew on all the ground.

(q) By which he was assured that it was a miracle of God.

Wesley's Notes

6:40 And God did so - See how tender God is, even of the weak; and how ready to condescend to their infirmities! These signs were very expressive. They are going to engage the Midianites. Could God distinguish between a small fleece of Israel, and the vast floor of Midian? Yes, by this token it appears that he can. Is Gideon desirous, that the dew of divine grace might descend on 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!

Matthew Henry's Concise Commentary

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.