Colossians 3:11:

Where there is neither Greek nor Jew, circumcision nor uncircumcision, Barbarian, Scythian, bond nor free: but Christ is all, and in all.

See also:

God Does Not Play Favorites
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