 Isaiah is speaking out of a definite historical context, and if you don't keep that in mind when you're reading the prophets, you're going to get lost, almost certainly. The first chapter sounds a lot like the siege of Jerusalem that took place about the time the house of Israel fell in 722. It was in the twelfth year of Ahaz the king of Judah that Hosea began to reign in Samaria, and he reigned for nine years. You'll find this in 2 Kings 17.