John Gill Commentary Jeremiah 48:44

"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 him, even upon Moab, the year of their visitation, saith Jehovah." — Jeremiah 48:44 (ASV)

He that flees from the fear
From terrible enemies he is afraid of, and dares not face them, but flees, in order to escape them: shall fall into the pit ;
into some misfortune or another: and he that gets out of the pit shall be taken in the snare ;
laid by the enemy for him, and so shall fall into his hands.

Sanctius very ingeniously observes that the allusion is to the hunting of deer, and such like creatures; when first a line of feathers of various colours is placed to frighten them; and if they get over that, then there is a pit dug for them, to catch them in; and if they get out of that, a snare is laid to take them; so that they rarely escape: and thus it would be with the Moabites, if they got rid of a first and second danger, a third would involve them; their destruction was certain, as follows; see (Isaiah 24:18) ;

for I will bring upon it, [even] upon Moab, the year of their
visitation, says the Lord ;
in a way of wrath and punishment; for which there was a time fixed, and was now at hand, and would quickly take place, according to the will and word of the Lord, of which Moab might be assured; who is expressed by name, for the sake of explanation, and that it might be manifest who was intended.