judges 6:11 And there came an angel of the LORD, and sat under an oak which was in Ophrah, that pertained unto Joash the Abiezrite: and his son Gideon threshed wheat by the winepress, to hide it from the Midianites. - Free Bible Online

      Jud 6:11-16. AN ANGEL SENDS GIDEON TO DELIVER THEM.

      11. there came an angel of the Lord--He appeared in the character and equipments of a traveller (Jud 6:21), who sat down in the shade to enjoy a little refreshment and repose. Entering into conversation on the engrossing topic of the times, the grievous oppression of the Midianites, he began urging Gideon to exert his well-known prowess on behalf of his country. Gideon, in replying, addresses him at first in a style equivalent (in Hebrew) to "sir," but afterwards gives to him the name usually applied to God.
      an oak--Hebrew, "the oak"--as famous in after-times.
      Ophrah--a city in the tribe of Manasseh, about sixteen miles north of Jericho, in the district belonging to the family of Abiezer (Jos 17:2).
      his son Gideon threshed wheat by the wine-press--This incident tells emphatically the tale of public distress. The small quantity of grain he was threshing, indicated by his using a flail instead of the customary treading of cattle--the unusual place, near a wine-press, under a tree, and on the bare ground, not a wooden floor, for the prevention of noise--all these circumstances reveal the extreme dread in which the people were living.

JFB.