question #1 Sahih Muslim 1092c, Book 13, Hadith 44 : What is the significance of having multiple Mu’adhdhins in the time of the Prophet Muhammad (ﷺ)?

Bilal announces Adhan at (the fag end of the) night (i. e. Sahri), so eat and drink till the son of Umm Maktum announces Adhan. And he (the narrator) said: And the (difference of time) between their (Adhans) was not more than this that one climbed down (from the minaret) and the other climbed up (to announce Adhan).