Title of the book is “Tazkira Hazrat Bilal Habshi Aur Hazrat Abdullah Ibn Umm-e-Maktoom (radiyallahu anhuma) “Written by Hazrat Maulana Muhammad Ashiq Ilahi Buland Shehri. This book is containing complete biography and history about the life of the first moazin of Islam and noble Sahabi of Rasulullah (sallallahu alaihi wasallam) Hazrat Bilal ra and a brief history of the second moazin of Islam Hazrat Abdullah Ibn Umm-e-Maktoom ra in Urdu pdf .