It is recorded by Muslim, and we have already cited it earlier—before the section on the adhān under Issue (6).

2. The second report comes from Abū Hurayrah with the same wording; it too was mentioned in that earlier discussion.

3. The third is related by Ibn Masʿūd: on the Day of the Trench the idol-worshippers kept the Messenger of Allah ﷺ from four prayers until a portion of the night had passed. He then instructed Bilāl to give the adhān; Bilāl gave the iqāmah and the Prophet prayed Zuhr, then he gave the iqāmah and prayed ʿAṣr, then he gave the iqāmah and prayed Maghrib, and finally he gave the iqāmah and prayed ʿIshāʾ. Al-Tirmidhī and others have transmitted it, and we have already discussed it under Issue (8), just before the section on the adhān.

9 – The adhān is recommended for someone who prays alone, for when he calls the adhān in a deserted land, troops of Allah—stretching as far as the eye can see—pray behind him.

There are several hadiths on this:

1. Anas narrates that one day the Prophet ﷺ paused to listen and heard a man saying, “Allāhu akbar, Allāhu akbar.” The Messenger of Allah ﷺ said, “In accord with the natural disposition (al-fiṭrah).” The man then said, “I bear witness that there is no god but Allah,” and he replied, “You have been delivered from the Fire.” When they looked, they found that the man was a goatherd.
   Muslim and others have recorded this ḥadīth, and it has already been cited under Issue (3) of the adhān. Ibn Khuzaymah also related it, in similar form, in his Ṣaḥīḥ—as quoted in al-Targhīb (1/110)—with a more complete wording: Anas (may Allah be pleased with him) said, “While the Prophet ﷺ was on a journey he heard a man saying, ‘Allāhu akbar, Allāhu akbar,’ whereupon the Prophet of Allah ﷺ said, ‘In accord with the natural disposition.’ The man then said, ‘I bear witness that there is no god but Allah.’ He said, ‘He has been delivered …’”