Judges 6:39

And Gideon said unto God, Let not thine anger be hot against me, and I will speak but this once: let me prove, I pray thee, but this once with the fleece; let it now be dry only upon the fleece, and upon all the ground let there be dew.

Cross-reference

Genesis 18:30 has Abraham using nearly identical wording when bargaining with God — a direct verbal parallel to Gideon's plea.

Genesis 18:32 shows Abraham's repeated bargaining with God — parallels Gideon's second request for a sign.