"Therefore the Moabites wail, they wail together for Moab. Lament and grieve for the men of Kir Hareseth. The fields of Heshbon wither, the vines of Sibmah also. The rulers of the nations have trampled down the choicest vines, which once reached Jazer and spread toward the desert. Their shoots spread out and went as far as the sea. So I weep, as Jazer weeps, for the vines of Sibmah. O Heshbon, O Elealeh, I drench you with tears! The shouts of joy over your ripened fruit and over your harvests have been stilled. Joy and gladness are taken away from the orchards; no one sings or shouts in the vineyards; no one treads out wine at the presses, for I have put an end to the shouting." NIV translation
The result of rejection of God's mercy is the removal of His hand of provision. As we see in this passage, the Moabites refused God's offer of mercy and so He removed the provision of their vineyards. Moab was known for its wine but did not acknowledge that it was the hand of God that caused the vines to grow and to produce a crop. When He removed His hand of provision, the harvest ended and they mourned over the fields but still did not see their sin of pride.