4 What is good about the Good News to other nation's ears?

There are many other nations named in the Scriptures as having a special relationship to Israel, Moab, Ammon, Egypt, Babylon, as the Good News comes to Israel, how does it affect each of these nations? And what of the rest of the seventy nations? What does it mean that Israel was commanded to offer sacrifices for each and all of them during the festival of Succoth? What does it mean that the following prophecy is written?

Even them will I bring to my holy mountain, and make them joyful in my house of prayer: their burnt offerings and their sacrifices shall be accepted upon mine altar; for mine house shall be called an house of prayer for all people, Isaiah 56:7