Omit and. “Thou art a Gilead unto me, a summit of Lebanon.”
Yet surely - literally, if not, the form of an oath with the imprecation omitted. For the full form see Numbers 14:23.
A wilderness, and cities - Omit and. The meaning is: If the house of David does not hear God’s words, though it be now grand as Lebanon, God will make it a wilderness, even uninhabited cities; the house of David being regarded as equivalent to the kingdom of Judah.