Allahumma Rabba Shahr Ramadhan - Daily Dua (Day & Night) اللهمَّ رَبَّ شَهْرِ | Ahlul Bayt Duas and Supplications

اللهمَّ رَبَّ شَهْرِ رَمَضانَ الَّذِي أَنْزَلْتَ فِيْهِ القُرْآنَ وَافْتَرَضْتَ عَلى عِبادِكَ فِيْهِ الصِّيامَ ارْزُقْنِي حَجَّ بَيْتِكَ الحَرامِ فِي هذا العامِ وَفِي كُلِّ عامٍ وَاغْفِرْ لِيَ الذُّنُوبَ العِظامَ فَإِنَّهُ لا يَغْفِرُها غَيْرُكَ يا ذا الجَلالِ وَالاِكْرامِ


Al-Kaf'amiy, in al-Balad al-Amin and al-Misbah has quoted the Kitab al-Ikhtiyar of Sayyid ibn Baqi that if one recites the following supplication everyday in Ramazan, Allah (swt) will forgive the sins of forty years of his age.
O Allah: the Lord of the month of Ramadhan, In which You revealed the Qur'an, And You imposed fasting on Your servants: (Please) confer upon me with the pilgrimage to Your Holy House, In this year and every year, And forgive my serious sins, For none can forgive them save You, O the Lord of majesty and honor.