اللَّهُمَّ تَقَبَّلْ صِيَامِي وَقِيَامِي وَرُكُوعِي وَسُجُودِي
Allahumma taqabbal siyami wa qiyami wa ruku'i wa sujudi
O Allah, accept my fasting, my standing in prayer, my bowing, and my prostration.
The anxiety of acceptance — will Allah accept my Ramadan? The Salaf used to spend six months after Ramadan asking Allah to accept the worship they did during it. Acceptance is not guaranteed by performance. You can fast perfectly and have it rejected because of a character flaw. This du'a asks for the one thing that matters: that your effort counts, that it registers, that it is not returned to you empty.
Related Du'as
ذَهَبَ الظَّمَأُ وَابْتَلَّتِ الْعُرُوقُ وَثَبَتَ الْأَجْرُ إِنْ شَاءَ اللَّهُ
The thirst is gone, the veins are moistened, and the reward is confirmed, if Allah wills.
Hasanوَبِصَوْمِ غَدٍ نَوَيْتُ مِنْ شَهْرِ رَمَضَانَ
I intend to fast tomorrow in the month of Ramadan.
Hasanاللَّهُمَّ أَهِلَّهُ عَلَيْنَا بِالْأَمْنِ وَالْإِيمَانِ وَالسَّلَامَةِ وَالْإِسْلَامِ رَبِّي وَرَبُّكَ اللَّهُ
O Allah, let this moon rise upon us with security, faith, safety, and Islam. My Lord and your Lord is Allah.
Hasanاللَّهُمَّ تَقَبَّلْ مِنَّا رَمَضَانَ وَأَعِنَّا عَلَى صِيَامِ سِتٍّ مِنْ شَوَّالٍ
O Allah, accept our Ramadan and help us fast six days of Shawwal.
Sahih