They are wet with the showers of the mountains - That is, the poor persons, or the travelers whom they have robbed. Hills collect the clouds, and showers seem to pour down from the mountains. These showers often collect and pour down so suddenly that there is scarcely time to seek a shelter.
And embrace the rock for want of a shelter - Take refuge beneath a projecting rock. The robbers drive them away from their homes, or plunder them of their tents, and leave them to find a shelter from the storm, or at night, beneath a rock. This agrees exactly with what Niebuhr says of the wandering Arabs near mount Sinai: “Those who cannot afford a tent, spread out a cloth upon four or six stakes; and others spread their cloth near a tree, or endeavor to shelter themselves from the heat and the rain in the cavities of the rocks. Reisebeschreib. i. Thes s. 233.