They are wet with the showers of the mountains - Mr. Good thinks that torrents, not showers, is the proper translation of the original זרם zerem; but I think showers of the mountain strictly proper. I have seen many of these in mountainous countries, where the tails of water-spouts have been intercepted and broken, and the outpouring of them would be incredible to those who have never witnessed similar phenomena. The rain fell in torrents, and produced torrents on the land, carrying away earth and stones and every thing before them, scooping out great gullies in the sides of the mountains. Mountain torrents are not produced but by such extraordinary outpourings of rain, formed either by water-spouts, or by vast masses of clouds intercepted and broken to pieces by the mountain tops.

And embrace the rock for want of a shelter - In such cases as that related above, the firm rock is the only shelter which can be found, or safely trusted.

wet

Songs 5:2 I sleep, but my heart wakes: it is the voice of my beloved that knocks, saying, Open to me, my sister, my love...

embrace

Lamentations 4:5 They that did feed delicately are desolate in the streets: they that were brought up in scarlet embrace dunghills.

Hebrews 11:38 (Of whom the world was not worthy:) they wandered in deserts, and in mountains, and in dens and caves of the earth.

Whether the Old Law Set Forth Suitable Precepts About the Members of the Household?
Objection 1: It would seem that the Old Law set forth unsuitable precepts about the members of the household. For a slave "is in every respect his master's property," as the Philosopher states (Polit. i, 2). But that which is a man's property should be his always. Therefore it was unfitting for the Law to command (Ex. 21:2) that slaves should "go out free" in the seventh year. Objection 2: Further, a slave is his master's property, just as an animal, e.g. an ass or an ox. But it is commanded (Dt. …
Saint Thomas Aquinas—Summa Theologica