Tafsir of An-Naml 27:53

(And We saved those who believed): [Referring to] Ṣāliḥ and those with him among the believers, (and were fearing [Allah]): from disbelief and acts of disobedience, a continuous fearing. Therefore, they were singled out for salvation.

It has been narrated that those who believed in him—peace be upon him—were four thousand. Ṣāliḥ went out with them to Ḥaḍramawt. When he entered it, he died, and that is why it was named by this name. The believers built a city in it called Ḥāḍūrā’. Discussion regarding this has already preceded, so remember it.