Gideon asked for a sign using a fleece: first that the fleece alone would be wet with dew while the ground was dry (Judges 6:36–38). Then he asked for the reverse—dry fleece with dew on the ground—and God did so (Judges 6:39–40).
In Judges 6:36–40 Gideon asks God for repeated confirmation that God will rescue Israel through him, “as you have spoken.” He sets up a wool fleece on a threshing floor and requests a sign involving dew and dryness, first one way and then the opposite. Each time, the requested condition happens exactly. This scene comes after God has already called Gideon and promised to be with him, and after Gideon has begun acting on that call (including confronting local worship practices). The Midianite threat still hangs over Israel, and Gideon is being drawn toward leadership in a risky conflict.
Gideon’s requests are explicitly tied to a prior promise: “as you have spoken” (verses 36–37). The narrative presents him seeking certainty that God will indeed “save Israel by my hand,” and it presents God as granting the requested confirmations twice (verses 38, 40).
A careful answer keeps the immediate passage, the book's argument, and the whole-Bible storyline together, so the question is answered in context instead of as a detached idea.
Start with Judges 6:36-38, then read the surrounding section so the answer stays connected to the passage's flow.
36Gideon said to God, If you will save Israel by my hand, as you have spoken,
37behold, I will put a fleece of wool on the threshing floor; if there be dew on the fleece only, and it be dry on all the ground, then shall I know that you will save Israel by my hand, as you have spoken.
38It was so; for he rose up early on the next day, and pressed the fleece together, and wrung the dew out of the fleece, a bowl full of water.