Isaiah 56:6

"Also the foreigners that join themselves to Jehovah, to minister unto him, and to love the name of Jehovah, to be his servants, everyone that keepeth the sabbath from profaning it, and holdeth fast my covenant; 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 my house shall be called a house of prayer for all peoples. The Lord Jehovah, who gathereth the outcasts of Israel, saith, Yet will I gather others to him, besides his own that are gathered."

There is a very curious mingling of expressions here with applications both to the old Israel in such terms as "burnt-offerings and sacrifices" and to the New Institution in words like, "my holy mountain" and "my house of prayer." Certainly the Jewish Temple was never "a house of prayer for all peoples"; Jesus called it a "den of thieves and robbers."

"The assurances and promises here to the foreigners and eunuchs who had been excluded from the Commonwealth of Israel, are that they should be received to the full enjoyment of of the richer privileges of the Christian Church; and a specific prediction is inserted respecting the ingathering of Gentiles generally.[5]

Speaking of Isaiah 56:8, here, McGuiggan stated that, "It is clear that `outcasts' here does not mean `all Jews,' but `the righteous remnant.'"[6]

The great promise held out for eunuchs in this chapter explains why the Ethiopian eunuch of Acts 8 happened to be reading in this part of Isaiah (Isaiah 53) when he encountered Philip on the road to Gaza and was baptized into Christ.