Contradiction with Jeremiah 48:47
While Isaiah 16:13 speaks of judgment on Moab, Jeremiah 48:47 promises the restoration of Moab's fortunes in the latter days.
Jeremiah 48:47: Yet will I bring again the captivity of Moab in the latter days, saith the LORD. Thus far [is] the judgment of Moab.
Contradiction with Deuteronomy 2:9
This verse shows God instructing Moses not to harass Moab or provoke them to war, which contrasts with the judgment pronounced in Isaiah 16:13.
Deuteronomy 2:9: And the LORD said unto me, Distress not the Moabites, neither contend with them in battle: for I will not give thee of their land [for] a possession; because I have given Ar unto the children of Lot [for] a possession. [Distress...: or, Use no hostility against Moab]
Contradiction with 2 Kings 3:27
Here, Moab sacrifices his son, leading to great wrath against Israel, contrasting with Isaiah 16:13 where Moab is judged.
2 Kings 3:27: Then he took his eldest son that should have reigned in his stead, and offered him [for] a burnt offering upon the wall. And there was great indignation against Israel: and they departed from him, and returned to [their own] land.
Contradiction with Ruth 1:4
These verses depict peaceful interaction and integration with Moabite women, contrasting the judgment in Isaiah 16:13.
Ruth 1:4: And they took them wives of the women of Moab; the name of the one [was] Orpah, and the name of the other Ruth: and they dwelled there about ten years.
Contradiction with Isaiah 15:1
Although it talks about Moab's burden, it emphasizes Moab's desolation rather than Isaiah 16:13's specific predicted time of judgment.
Isaiah 15:1: The burden of Moab. Because in the night Ar of Moab is laid waste, [and] brought to silence; because in the night Kir of Moab is laid waste, [and] brought to silence; [brought...: or, cut off]