Judges 6:36-40

Then Gideon said to God, “You say that you have decided to use me to rescue Israel. Well, I am putting some wool on the ground where we thresh the wheat. If in the morning there is dew only on the wool but not on the ground, then I will know that you are going to use me to rescue Israel.” That is exactly what happened. When Gideon got up early the next morning, he squeezed the wool and wrung enough dew out of it to fill a bowl with water. Then Gideon said to God, “Don't be angry with me; let me speak just once more. Please let me make one more test with the wool. This time let the wool be dry, and the ground be wet.” That night God did that very thing. The next morning the wool was dry, but the ground was wet with dew.