Authentic.
This indicates that Ishmael and his descendants are the elite among Abraham’s children, which in turn means that they are superior to the descendants of Isaac. Now the descendants of Isaac—the Children of Israel—are acknowledged to be the noblest of the non-Arab nations, for among them were both prophethood and scripture. Therefore, once precedence over those people is established, it is affirmed a fortiori over all others, and this is sound.
Yet someone may argue that the ḥadīth merely shows Ishmael to be the one chosen from Abraham’s offspring and the Banū Kinānah to be the ones chosen from Ishmael’s offspring, without implying that all of Ishmael’s descendants are likewise preferred over the rest of humanity, for their forefather was chosen while some of them were chosen above others.
The reply is: Had that not been the purpose of the report, there would have been no benefit in mentioning Ishmael’s election at all, if his being chosen did not entail the election of his progeny. On that assumption there would be no difference between referring to Ishmael and referring to Isaac.
Taken together with the other aḥādīth, this shows that they all convey a single meaning.
Know as well that the traditions concerning the merit of Quraysh, and then of the Banū Hāshim specifically, are numerous—though this is not the place to cite them—and they too bear witness to this. The relation of Quraysh to the Arabs is like that of the Arabs to the rest of mankind, and the Sacred Law was revealed in accordance with that, as we shall hint at shortly.