Let their habitation be desolate; literally, their encampment Tirah ( טִירָה) is the circular enclosure of a nomadic tribe, within which it kept its cattle or took refuge itself (Genesis 26:16; Numbers 31:10).
Nomadic expressions remained in use after nomadic habits had ceased (see 1 Kings 12:16). And let none dwell in their tents. A duplication of the preceding clause.