“All Israel” in Rom 11:25-26 is one of crux interpretum in Romans as a whole. Most scholarship has tended to regard the use of “All Israel” as a national term equivalent to “the Jewish.” However, for instance, as Psalm of Solomon which belongs to Jewish literature contemporary with Romans shows, this specific term is understood as referring to “the covenant-centered community” rather than a national term equivalent to “the Jewish.” Such an understanding of this term can find its support in the book of Isaiah which the author of Psalm of Solomon considerably cited or alluded to in the chapter 17. In this regard, first, after delving into Paul’s use of the combined citation of the book of Hosea and Isaiah in Rom 9-11 to make sense of Paul’s hermeneutical key to understanding his argumentation in Rom 9-11, and, second, from the vantage point of such a hermeneutical key, we come to understand that “All Israel” in Rom 11:25-26 also refer to “the covenant-centered community” comprised of Jews and Gentile and established on the same footing of faith in Jesus Christ.