John Trapp on Isaiah 16:14

Ver. 14. Within three years] In which time the ſins of the Moabites ſhall be full, and themſelves ripe and ready for vengeance. Three years hence therefore, ſc. in the fourth year of King Hezekiah: for then came up Salm inezer againſt Samaria, and tis probable, that in his march thither he invaded and ſubdued theſe Moabites, that he might leave all ſafe behind him. An hundred years after which, or more, Nebuchadnezzar utterly ruined them, according to Jer. 48.

As the years of an hireling] i. e. praeciſè, nec citius nec tardius, three years preciſely. This time Moab had to make his peace in: but he minded nothing leſs, and therefore deſervedly periſhed. So, alas, ſhall all ſuch infallibly as repent not within their three years ſpace, which perhaps may not be three moneths, or three dayes, ſaith Oecolampadius, I may add, three minutes: and yet ex hoc momento pendet aeternitas, upon this ſhort inch of time dependeth eternity. Up therefore and be doing: Stat ſua cuique dies, &c.