Ayyūb, from Abū Qilābah, from Anas:
“Bilāl was commanded to recite the adhān in pairs and to render the iqāmah single.” (1)

254 – Abū ʿAmr ibn Ḥamdān Muḥammad ibn Aḥmad al-Ḥīrī *

The Imām, ḥadīth scholar, trustworthy authority, distinguished grammarian, ascetic worshipper, and musnid of Khurāsān: Abū ʿAmr Muḥammad ibn Aḥmad ibn Ḥamdān ibn ʿAlī ibn Sinān al-Ḥīrī.

He was born in 283 AH.

His father, the ḥāfiẓ Abū Jaʿfar, took him on scholarly journeys through Persia, Iraq, al-Jazīrah, and the surrounding regions; many teachers had him listen to their narrations. Muḥammad himself pursued learning, wrote extensively, distinguished himself, excelled in Arabic, and his merits are many—may Allah have mercy on him.

In 299 AH, when he was sixteen years old or slightly older, he travelled to al-Ḥasan ibn Sufyān al-Nasawī and heard a large body of traditions from him. He then went to Ahwāz and related copiously from ʿAbdān al-Jawāliqī; to Mosul, where he narrated abundantly from Abū Yaʿlā; to Jurjān, transmitting extensively from ʿImrān ibn Mūsā ibn Mujāshiʿ al-Sakhtiyānī. In Basra he heard from Zakariyyā al-Sājī and Muḥammad ibn al-Ḥusayn ibn Mukram, and in Baghdad he received traditions from Aḥmad