Isaiah 16:8-9. “For the fields of Heshbon languish, and the vine of Sibmah: the lords of the heathen have broken down the principal plants thereof, they are come even unto Jazer, they wanered through the wilderness: her branches are stretched out, they are gone over the sea. Therefore I will bewail with the weeping of Jazer the vice of Sibmah: I will water thee with my tears, O Heshbon, and Elealeh: for the shouting for thy summer fruits and for thy harvest is fallen.”
In his lamenting over the fall of Moab, Isaiah describes how even the agricultural fields have been torn apart by the enemy, and left desolate, with no one to cultivate the vines.
Heshbon was the capital of Sihon. Sibmah is perhaps the same as Sumia, three miles west of Heshbon.
It was customary, during the harvest and especially the harvest of grapes, for the people to rejoice with loud singing and shouts of joy for the bounty of the vines. That would not happen when Moab fell to Assyria. It would be quiet throughout the land, except for the weeping of the survivors.