اللَّهُمَّ تَقَبَّلْ مِنَّا إِنَّكَ أَنْتَ السَّمِيعُ الْعَلِيمُ وَتُبْ عَلَيْنَا إِنَّكَ أَنْتَ التَّوَّابُ الرَّحِيمُ
Allahumma taqabbal minna innaka Antas-Sami'ul-'Alim, wa tub 'alayna innaka Antat-Tawwabur-Rahim
O Allah, accept from us, for You are the All-Hearing, the All-Knowing. And turn to us in mercy, for You are the Acceptor of repentance, the Most Merciful.
This is adapted from the du'a of Ibrahim and Isma'il (AS) when building the Ka'bah. It is commonly recited after completing Taraweeh prayers in Ramadan, asking Allah to accept the worship just performed.
Related Du'as
اللَّهُمَّ لَكَ صُمْتُ وَعَلَى رِزْقِكَ أَفْطَرْتُ
O Allah, for You I have fasted and with Your provision I break my fast.
Hasanاللَّهُمَّ ارْحَمْنِي بِالْقُرْآنِ وَاجْعَلْهُ لِي إِمَامًا وَنُورًا وَهُدًى وَرَحْمَةً
O Allah, have mercy on me through the Quran, and make it for me a guide, a light, a source of guidance, and a mercy.
Hasanاللَّهُمَّ أَعِنِّي عَلَى صِيَامِهِ وَقِيَامِهِ
O Allah, help me to fast and pray during it (Ramadan).
Atharاللَّهُمَّ صَلِّ عَلَى مُحَمَّدٍ وَعَلَى آلِ مُحَمَّدٍ كَمَا صَلَّيْتَ عَلَى إِبْرَاهِيمَ وَعَلَى آلِ إِبْرَاهِيمَ إِنَّكَ حَمِيدٌ مَجِيدٌ
O Allah, send blessings upon Muhammad and the family of Muhammad, as You sent blessings upon Ibrahim and the family of Ibrahim. Indeed, You are Praiseworthy and Glorious.
Sahih