Shall sound, through compassion to them; of which See Poole on "Isaiah 15:5". In excessive griefs the bowels are sometimes rolled and tumbled together, so as to make an audible noise. Hereby he signifies the greatness of their approaching calamity, which being so grievous to him, must needs be intolerable to them.
Related Commentaries of Isaiah 16:11
Isaiah 16:11
11 Wherefore my bowels shall sound like an harp for Moab, and mine inward parts for Kirharesh.