Galatians 3:28:

There is neither Jew nor Greek, there is neither bond nor free, there is neither male nor female: for ye are all one in Christ Jesus.

See also:

God Does Not Play Favorites
Was God Unfair to Job?
Objection: God Can and Did “Play Favorites” with Healing; Jesus Was Only Sent to the Jews, and Gentiles Were Excluded from God’s Healing Covenant
Notes on 2 Kings 5:1-14