Let the wilderness and the cities thereof lift up their voice, the villages that Kedar doth inhabit: let the inhabitants of the rock sing, let them shout from the top of the mountains.
The wilderness and the cities - in a region not wholly waste, but mainly so, with an oasis here and there.
Kedar - in Arabia Deserta (Isaiah 21:16; Genesis 25:13). The Kedarenians led a nomadic, wandering life. So Kedar is here put in general for that class of men.
The inhabitants of the rock - Sela, i:e., Petra, the metropolis of Idumea and the Nabathoean Ishmaelites. Or, it may refer in general to those in Arabia Petrea, who had their dwellings cut out of the rock.
Let them shout from the top of the mountains namely of Paran south of Sinai in Arabia Petrea Let them shout from the top of the mountains - namely, of Paran, south of Sinai, in Arabia Petrea (Vitringa).