I'm still looking, but Romans 2:28 kind of works 

 Romans 2:29 🎯 

 The argument of Romans (esp. ch. 9), and that of Galatians. But in a verse, Gal. 3:29 will do. Or Phil. 3:3. Both in context.

Those who are of the same *faith8 of Abraham (in Christ)--not just the same *blood*--are the offspring of Abraham, and subject to all the promises.