تَقَبَّلَ اللَّهُ مِنَّا وَمِنْكُمْ
Taqabbalallahu minna wa minkum
May Allah accept from us and from you.
The traditional Eid greeting exchanged between Muslims. The Companions would say this to each other after Ramadan and on Eid. The focus is not on congratulation but on acceptance — the fear that your fasting, your prayers, your charity might not be accepted. Even after 30 days of worship, the believer's attitude is: "I hope it counted." This du'a carries that beautiful anxiety.
Related Du'as
اللَّهُمَّ أَعِنِّي عَلَى صِيَامِهِ وَقِيَامِهِ
O Allah, help me to fast and pray during it (Ramadan).
Atharاللَّهُمَّ 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.
Hasanإِنِّي صَائِمٌ إِنِّي صَائِمٌ
I am fasting, I am fasting. (Say this when provoked while fasting.)
Sahihاللَّهُمَّ تَقَبَّلْ صِيَامِي وَقِيَامِي وَرُكُوعِي وَسُجُودِي
O Allah, accept my fasting, my standing in prayer, my bowing, and my prostration.
Athar