Shof'tim (Jdg) 6:36-40

Gid‘on said to God, “If you are going to save Isra’el through me, as you said you would, then, here: I will lay a wool fleece on the threshing-floor; if there is dew on the fleece only, while all the ground stays dry, I will be convinced that you will save Isra’el through me, as you said you would.” And it happened! He got up early in the morning, pressed the fleece together and wrung dew out of it, a bowlful of water. But Gid‘on said to God, “Don’t be angry with me because I am asking one more thing, let me make one more test, please: this time let it be dry only on the fleece, with dew all over the ground.” And that is what God did that night — it was dry only on the fleece, even though there was dew all over the ground.