“I swear by Him Who has sent me with the truth as Prophet; Archangel Gabriel has reported to me from Archangel Israfel who directly reports from Almighty Allāh that one who offers this prayer, (at the last night of Ramzān al-Mubarak) [Links in attachment]will not raise his head from prostration before Almighty Allāh would forgive him, accept his acts during the month of Ramzān , and overlooks his sins..."
[Reference: Mafatih al-Jinan]
Dua for Twenty-eighth Ramzan al-Mubarak
بِسْمِ اللهِ الرَّحْمٰنِ الرَّحِيْمِ
Allaahumma Waffir H’az’z’ee Feehi Minan Nawaafil Wa Akrimnee Feehi Bi-Ih’z”Aaril Masaaa-Il Wa Qarrib Feehi Waseelatee Ilayka Min Baynil Wasaaaa-Eel Yaa Man Laa Yashghaluhi Ilh’aah’ul Mulh’h’een
O Allah increase my enjoyment and satisfaction, in this month, in the prayers I pray out of my own free will, kindly make haste in quick disposal of my affairs in my interest, let me be near to the “Means of Approach” (Muhammad and Aali Muhammad) who are the select best medium to gain Thy favours, O He who does not get confused on account of the ceaseless demands of the countless beseechers, but attend to each and every supplication.