John Calvin Commentary Isaiah 16:11

"Wherefore my heart soundeth like a harp for Moab, and mine inward parts for Kir-heres." — Isaiah 16:11 (ASV)

Therefore my bowels shall sound like a harp for Moab. Assuming the character of a Moabite, the Prophet again describes excessive lamentation. This lamentation proceeds from grief so intense that even the bowels make a distressing noise.

For by this sign, he intended to point out the reality. We have previously explained the purpose of these lively descriptions: to bring the events, so to speak, before our eyes, and to lead us to hold stronger hopes for those things that seem to go beyond all belief.

By again naming Kir-Hareseth, the chief city, and thus taking a part for the whole, he describes the destruction of the whole country.