Genesis 13:15

And to: This is by way of explanation to the former words: (Haydock) for Abram never possessed a foot of this land by inheritance, Acts viii. 5. Even his posterity never enjoyed it, at least, for any long time. St. Augustine gives the reason; because the promise was conditional, and the Jews did not fulfil their part by obedience and fidelity. (q. 3. in Gen.) It is better, however, to understand these promises of another land, which the people, who imitate the faith of Abram, shall enjoy in the world to come. (Calmet) (Romans iv. 16.)