so ʿUmar said to him, “To whom, in your view, should I assign the call to prayer?”
He replied, “To Saʿd, for he used to give the adhān for the Messenger of Allah ﷺ.”
Accordingly, ʿUmar entrusted it to Saʿd and to his descendants (1).

Hammād ibn Salama transmitted—from ʿAlī ibn Zayd, from Saʿīd ibn al-Musayyab—that when Abū Bakr sat on the pulpit one Friday, Bilāl said to him, “Did you set me free for Allah’s sake or for your own?”
He answered, “For Allah’s sake.”
Bilāl said, “Then allow me to go out on campaign.”
Abū Bakr gave him leave, so Bilāl travelled to Syria and died there (2).

Muḥammad ibn Naṣr al-Marwazī reported: Aḥmad ibn ʿAbd al-Raḥmān al-Qurashī told us; al-Walīd ibn Muslim related to us; Saʿīd ibn ʿAbd al-ʿAzīz, Ibn Jābir and others informed me that Bilāl never gave the adhān for anyone after the Messenger of Allah ﷺ. He wished to engage in jihād, but Abū Bakr tried to restrain him.
Bilāl said, “If you emancipated me for Allah’s sake, then let me go.”
He remained in Syria until ʿUmar arrived at al-Jābiyah. The Muslims asked ʿUmar to request Bilāl to call the adhān for them. ʿUmar asked him, and Bilāl called the adhān for one day; never was a day seen with more weeping than that, for it reminded them of the Prophet ﷺ.
Al-Walīd added, “We therefore hold that the adhān of the people of Syria derives from the call he gave on that day” (3).

Hishām ibn Saʿd narrated—from Zayd ibn Aslam, from his father—that: “We came to Syria with ʿUmar. Bilāl gave the adhān, and the people remembered the Prophet ﷺ; I have never seen a day with more weeping than that.”

Abū Aḥmad al-Ḥākim (4) said: “Muḥammad ibn al-Fayḍ in Damascus informed us; Abū Isḥāq narrated to us…"