Musannaf Ibn Abi Shaybah 32295 — Studying and reviewing the Quran

Sayyiduna Ibn Abbas (may Allah be pleased with them both) said: Indeed the Messenger of Allah (peace and blessings be upon him) used to go over the Qur'an in recitation once in every Ramadan, except for the year in which he (peace and blessings be upon him) passed away. In that year he (peace and blessings be upon him) went over it twice in the presence of Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him), so he (Sayyiduna Abdullah) witnessed what was abrogated and what was changed.