John Trapp on Isaiah 15:7-8

Ver. 7. Therefore the abundance they have gotten] Here the Prophet ſeemeth to tax the covetouſneſs of the Moabites, qui coacervandis theſauris operam dederint, who made it their work, to hoard and heap up riches.

And that which they have laid up] Heb. their viſitation, that is their treaſures which they often looked upon.

Shall they carry away to the brook of the willows] The Moabites ſhall caſt it into the water; as hoping there to find it again, when the enemy was gone: Or, ſhall they (the Aſſyrians) carry away to the valley of the Arabians, who were their confederates, and for ſuch good offices ſpared (as Herodotus ſaith Lib. 3.) that, that they might keep and convey home for them, the ſpoils they had taken from other nations.

Piſcat.Ver. 8. For the cry is gone round about, &c.] When the Prophet thus deſcribeth the mourning of the Moabites as exceſſive, and as a fruit of their unbelief, we muſt learn to moderate our mourning for outward loſſes and croſſes; and that out of hope of Gods mercy promiſed to his penitent ſuppliants.

The howling thereof unto Eglaim] See on ver. 2.