'Empty' in the Bible

The ark was empty except for the two stone tablets that Moses had placed there at Horeb when the LORD had made a covenant with the Israelis after they had come out of the land of Egypt.

because this is what the LORD God of Israel says: "That jar of flour will not run out, nor will that bottle of oil become empty until the very day that the LORD sends rain on the surface of the ground.'"

The jar of flour never ran out and the bottle of oil never became empty, just as the LORD had promised through Elijah.