'Third' in the Bible

In that day Israel will be the third party with Egypt and with Assyria [in a Messianic league], a blessing in the midst of the earth,

“This shall be the sign [of these things] to you [Hezekiah]: you are to eat this year what grows of itself, and in the second year that which springs from the same, and in the third year you are to sow and harvest, and plant vineyards and eat their fruit.