Tafsir al-Jalalain (Arabic: Tafsir al Jalalayn تفسير الجلالين, literal meaning: 'the interpretation of two Jalals') is a book of famous commentary of the Quran, which was originally developed by Jalaluddin al Mahalli in 1459, and then continued by Jalaluddin as- Suyuti, his student in 1505.