Musannaf Ibn Abi Shaybah 32307 — Those of the companions of Ibn Masud

Mansur said that Ibrahim said: Among the companions of Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him), these were the ones who gave fatwas and taught the Qur'an: Alqamah, al-Aswad, Ubaydah, Masruq, Amr bin Shurahbil and al-Harith bin Qays.