Judges 6:33-37

Then all the Midianites and the Amalekites and the children of the east were gathered together, and went over, and pitched in the valley of Jezreel.

But the Spirit of the LORD came upon Gideon, and he blew a trumpet; and Abi-ezer was gathered after him.

And he sent messengers throughout all Manasseh; who also was gathered after him: and he sent messengers unto Asher, and unto Zebulun, and unto Naphtali; and they came up to meet them.

And Gideon said unto God, If thou wilt save Israel by mine hand, as thou hast said,

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.