al-awaasim wa al-qawaasim was written by Ash-Shaykh al-Imaam al-Allaamah Muhammad bin Ibraheim al-Waeer al-Yamani. This book examines the reason's for Iktilaaf in the Ummah of Muhammd from the View Point of Aqeedah, Fiqh, Usool al-Fiqh and Haadith. Printed in Beirut by Mu'assatur Rislaah in 5 volumes on yellow paper, there is no other book like it!
al-Imaam ash-Showkani said about ash-Shaykh Muhammad Ibraheim al-Wazeer "I'm sure that If you gathered all of his Shuyookh and made them into one person then then It still couldn't be compared to his knowledge. If it is said that Yemen will not produce another like him, then this is not Far from the truth" ..
الشوكاني البدر الطالع 91/3