John Calvin on Jeremiah 48:42

He repeats what we have before observed, that the calamity of Moab would be a just reward for his pride and indeed his sacrilege. The Prophet then says that though God’s vengeance might seem extremely grievous, yet it was most just, because the Moabites had not only been cruel against their neighbors, but also reproachful against God. Here, then, he condemns them first for cruelty, and then for their impious pride, because they exalted themselves against God

But we must bear in mind the reason noticed before; for the Moabites did not openly boast that they were equal or superior to God, but when they raised their crests against God’s people, they became contumelious against God himself, who had promised to be the protector and the Father of his people. As then the Moabites thus despised the protection and promise of God, they are here justly condemned by the Prophet, that they exalted themselves against God And this ought to be carefully noticed, so that we may not do any wrong to the godly, for God will at length show that he is injured in their persons. And then also no common consolation may be hence derived, that all who molest us are carrying on war against God, and that all who injure us act sacrilegiously towards him. For the Prophet has before explained how the Moabites gloried against God, even because they regarded the children of Israel with derision. It follows, —

Jeremiah 48:43-44

43. Fear, and the pit, and the snare, shall be upon thee, O inhabitant of Moab, saith the LORD.

43. Terror et fovea et laqueus super to, habitator Moab, dicit Jehova.

44. He that fleeth from the fear shall fall into the pit; and he that getteth up out of the pit shall be taken in the snare: for I will bring upon it, even upon Moab, the year of their visitation, saith the LORD.

44. Qui fugerit a facie terroris incidet in foveam; et qui ascenderit e fovea laqueo capietur; quoniam adducam super eam, super Moab, annum visitationis ipsorum, dicit Jehova.