John Calvin on Isaiah 15:8

8. The cry is gone round about the borders of Moab. {Bogus footnote} כי, (ki,) for, is added for the sake of ornament. He means that every part of that country all around shall be full of crying and howling; because that destruction reaches from one extremity to another. Besides the crying he twice mentions the howling, to denote the excess of grief, as men who are in despair surrender themselves entirely to lamentation.