The promise, that he should be the heir of the world — Is the same as that he should be "the father of all nations," namely, of those in all nations who receive the blessing. The whole world was promised to him and them conjointly. Christ is the heir of the world, and of all things; and so are all Abraham's seed, all that believe in him with the faith of Abraham
Related Commentaries of Romans 4:13
Romans 4:13
13 For the promise, that he should be the heir of the world, was not to Abraham, or to his seed, through the law, but through the righteousness of faith.