Cross reference
1 Chronicles 21:20
20 And Ornan turned back, and saw the angel; and his four sons with him hid themselves. Now Ornan was threshing wheat.
Judges 6:11
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.