O Allah, I ask You. O Allah, You are the One, the Only, Self-Sufficient Master, Who was not begotten...
Reference:An-Nasa'i 3/52, Ahmad 4/338. See also Al-Albani, Sahih An-Nasa'i 1/280 and Sifat Salatun-Nabi, pg. 204.Hisnul Muslim 63
اللّهُـمَّ إِنِّـي أَسْأَلُـكَ يا اللهُ بِأَنَّـكَ الواحِـدُ الأَحَـد الصَّـمَدُ الَّـذي لَـمْ يَلِـدْ وَلَمْ يولَدْ وَلَمْ يَكـنْ لَهُ كُـفُواً أَحَـد أَنْ تَغْـفِرْ لي ذُنـوبي إِنَّـكَ أَنْـتَ الغَفـورُ الرَّحِّـيم
Allāhumma innī as'aluka yā Allāhbi'annaka ‘l-Wāḥidu ‘l-Aḥaduṣ-ṣamad. alladhī lam yalid wa lam yūlad. wa lam yakun lahu kufuwan aḥad. an taghfir lī dhunūbī. innaka anta ‘l-Ghafūrur-Raḥīm.
O Allah, I ask You. O Allah, You are the One, the Only, Self-Sufficient Master, Who was not begotten and begets not, and none is equal to Him. Forgive me my sins, surely you are Forgiving, Merciful.