Cross reference
1 Chronicles 21:20
20 And Ornan, turning back, saw the angel, and his four sons who were with him went to a secret place. Now Ornan was crushing his grain.
Judges 6:11
11 Now the angel of the Lord came and took his seat under the oak-tree in Ophrah, in the field of Joash the Abiezrite; and his son Gideon was crushing grain in the place where the grapes were crushed, so that the Midianites might not see it.