The word "Iftitah" translates to "Opening." Dua Al-Iftitah is the supplication for "opening the doors of blessings and mercy." It was specifically taught by Imam Mahdi (the 12th Imam in Shia Islam) to his followers during the occultation (Ghaybah) as a means of staying connected to divine grace.
The primary source for Du‘ā’ al-Iftitāḥ is Iqbāl al-A‘māl by Sayyid Ibn Ṭāwūs (d. 664 AH), who transmits it from his chain going back to Imām Mahdī via the second deputy (al-Nā’ib al-Thānī), Muḥammad ibn ‘Uthmān al-‘Amrī. A second strand appears in Miṣbāḥ al-Mutahajjid by Shaykh al-Ṭūsī (d. 460 AH). While some contemporary scholars question the direct attribution to the Imām, the mainstream Shī‘ī tradition accepts it as authentic (ṣaḥīḥ) in content (maḍmūn) if not in every link. The supplication’s early presence in canonical works lends it liturgical authority. Dua Al-iftitah Pdf