'Open' in the Bible

At that time, when Jeroboam had left Jerusalem, the prophet Ahijah the Shilonite met him on the road; the two of them were alone in the open country. Ahijah was wearing a brand new robe,

That day he also announced a sign, "This is the sign the Lord has predetermined: The altar will be split open and the ashes on it will fall to the ground."

The altar split open and the ashes fell from the altar to the ground, in fulfillment of the sign the prophet had announced with the Lord's authority.