Isaiah 56:1-8 is a prophetic sermon encouraging Israel to keep covenant, represented by Sabbath keeping, while they wait for salvation to come through the suffering servant. Isaiah warns Israel that they should not presume their salvation based on their ancestry but that those who are saved and will be saved are those who keep Sabbath. Therefore, he gives a couple of radical examples: foreigners and eunuchs and he describes what will come for eunuchs and foreigners who keep Sabbath in the new covenant (described using the types of the old covenant). The point is that it does matter how you live. Because salvation was near they should keep justice and do righteousness. Given the emphasis on Sabbath keeping, I stressed the importance of observing the Lord's Day where all nations gather together into the house of prayer on the heavenly Mount Zion.