'It's' in the Bible

All this comes about due to the transgression of Jacob, and due to the sins of the house of Israel. What is Jacob's sin? It's Samaria, isn't it? And what's Judah's high place? It's Jerusalem, isn't it?

The best of them is like a thorn, and their most upright like a hedge of thorns. The day announced by your watchmen and by your own calculations approaches. Now it's your time to be confused!