Isaiah 56:3 RSV — Let not the foreigner who has joined himself to the LORD say, “The LORD will surely separate me from his people”; and let not the eunuch say, “Behold, I am a dry tree.”
Isaiah 56:7 RSV — these I will bring to my holy mountain, and make them joyful in my house of prayer; their burnt offerings and their sacrifices will be accepted on my altar; for my house shall be called a house of prayer for all peoples.
This chapter continues the theme of inclusion from 55. It is amazing to see this message hundreds of years before Jesus stretches his ministry out to the wide world.
Here is also a damning condemnation of what Israel has become:
The door is opened to all believers and the earthly hierarchy is smashed.