From the time of the fall in Genesis 3 through the coming Christ, God’s promises were primarily directed towards and ethnic people, Israel.  But, God’s plan was never just to extend his covenant only to Jewish people, his people were always to be a light for the nations.  Isaiah 56:1-8 and specifically verses 6-8 show us that the people of God who are welcomed into house of the Lord are not marked by outward appearance but by inward loving obedience.

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Resources:

Isaiah 56:6-8

ESV Study Bible

Isaiah: God Saves Sinners, by Ray Ortlund

Isaiah: The NIV Application Commentary, by John Oswalt

Isaiah (Tyndale Old Testament Commentary), by Alec Moyter

Single in Christ: A Name Better than Sons and Daughters, by John Piper