Matthew Poole and continuators on Jeremiah 46:18

18 As I live, saith the king, whose name is the LORD of hosts, surely as Tabor is amongst the mountains, and as Carmel by the sea, so shall he come .

That is, he shall as certainly come and incompass you with his Armies as Tabor is encompassed with mountains, and as Carmel is by the Sea, or as Barak going down from mount Tabor destroyed Sisera's Army, or as surely as the Rain came which Elijah first discovered from Mount Carmel, 1 Kings 18.41, 42. there are other guesses at the sense of this comparison, but the sense is undoubtedly no more then that Nebuchadnezzar should certainly come against Egypt, how vainly soever the Egyptians flattered themselves to the contrary supposing the time past which the Prophet spake of.