Judges 6:37

37 look, I will place a wool fleece on the threshing floor. If there is dew only on the fleece and all the ground is dry, then I will know that you will save Israel by my hand, as you said.”

Read Judges 6:37 Using Other Translations

Behold, I will put a fleece of wool in the floor; and if the dew be on the fleece only, and it be dry upon all the earth beside, then shall I know that thou wilt save Israel by mine hand, as thou hast said.
behold, I am laying a fleece of wool on the threshing floor. If there is dew on the fleece alone, and it is dry on all the ground, then I shall know that you will save Israel by my hand, as you have said."
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.”