To understand the magnitude of this promise better, we need to know the background. The book of Isaiah was written by the prophet Isaiah and relates both to events that were current then during the reigns of Uzziah, Jotham, Ahaz and Hezekiah (Isaiah During Isaiah’s times, Judah and Jerusalem had backslidden and began to worship foreign Gods (Isaiah This brought the wrath of God on the Israelites. Isaiah prophetically foretells the doom of the divided kingdom of Israel.