Isaiah 16:13

The obvious meaning here is that God's prophecies against Moab given in time past (either by Isaiah, or by others, or by both) are about to be fulfilled. "In three years precisely the glory of Moab shall be brought low, and only an insignificant remnant shall survive."[15] The way in which Isaiah distinguished between "three years exactly," and "about three years" is interesting. By specifying, "as the years of a hireling," he meant that, "The hired servant serves for the three years exactly. The master sees to it that it shall be no less; the servant takes care that it shall be no more.[16]