Majma' al-Bayan fi Mukhtalif al-Qur'an, commonly referred to as Majma' 39, is a renowned Arabic commentary on the Holy Quran written by the esteemed Islamic scholar, Muhammad ibn al-Hasan al-Tihrani (d. 1325 CE). This seminal work is considered one of the most important and influential Quranic exegeses in Islamic history. In this paper, we will explore the significance, methodology, and key features of Majma' 39, providing insights into its author, context, and contributions to Quranic studies.