In Isaiah 3:1 and Isaiah 3:26 we read that God will judge Jerusalem because of his sin—that judgment has come in the Babylonian Exile. The people in exile are comforted by God (Isaiah 40:1): he will come to his people to redeem them (just like Jesus has come to redeem his people, Mark 10:45). The Servant of the Lord will suffer for them (Isaiah 53:1–12, a prophecy of Jesus). In Isaiah 56 the Lord says: my salvation will come
(Isaiah 56:1). He gathers the exiles of Israel (Isaiah 56:8) and also foreigners: they are not excluded (any longer): for my house shall be called a house of prayer for all peoples
(Isaiah 56:6–7). Meanwhile God reproaches the leaders: [Israel’s] watchmen are blind; they are all without knowledge
(Isaiah 56:10). They are shepherds without understanding (Isaiah 56:11).
17 And he was teaching them and saying to them, “Is it not written, ‘My house shall be called a house of prayer for all the nations’? But you have made it a den of robbers.”