In discussions of Paul's letters, much attention has been devoted to statements that closely identify Christ with Israel's God (i.e., 1 Cor 8:6). However, in Rom 3:30 and Gal 3:20, Paul uses the phrase "God is one" to link Israel's monotheistic confession and the inclusion of the Gentiles in the people of God. Therefore, this study traces the OT and early Jewish backgrounds of the phrase "God is one" and their possible links to Gentile inclusion...