Tafsir al-Jalalayn - meaning 'The Commentary of the Two Jalal’s' is named after its two authors: Jalaluddin al-Mahalli (1389-1459), who wrote half of it, and his student, Jalaluddin as-Suyuti (1445-1505), one of the greatest Muslim scholars of all, who completed it after al-Mahalli s death. For half a millennium Tafsir al-Jalalayn has been considered the essential first step in the study of the meanings of the Quran by teachers and students throughout the Islamic world Although it is among the shortest and simplest of the complete commentaries.