The angel of Yahweh came, and sat under the oak which was in Ophrah, that pertained to Joash the Abiezrite: and his son Gideon was beating out wheat in the winepress, to hide it from the Midianites.
In our own times, we cannot ask God for a sign as did Moses and Gideon, because we have the "perfect" revelation from God already certified unto us in the sacred pages of the Holy Bible.  "That which is perfect" indeed has come.