'Three' in the Bible

My heart cries out for Moab;His fugitives are [fleeing] as far as Zoar and Eglath-shelishiyah.For they go up the ascent of Luhith weeping;For on the road to Horonaim they raise a cry of distress over their destruction.

But now the Lord speaks, saying, “Within three years, as the years of a hired man [who will not serve longer than the agreed time], the glory of Moab will be degraded along with all the great population, and the remnant [that survives] will be very small and of no account.”

“Yet gleanings will be left in the land [of Israel] like the shaking of the olive tree,Two or three olives on the topmost branch,Four or five on the [outermost] branches of the fruitful tree,”Declares the Lord, the God of Israel.

And the Lord said, “Even as My servant Isaiah has walked stripped and barefoot for three years as a sign and forewarning concerning Egypt and Cush (Ethiopia),