'Whoever, fasted the month of Ramadan out of sincere faith and

hoping for a reward from Allah,

then all his past sins will be forgiven.

[Abu Hurairah]

بِسْمِ اللهِ الرَّحْمٰنِ الرَّحِيْمِ

Bismillahir rahma nir rahim
In the Name of Allah, the Most Gracious, the Most Merciful.

A person's intention when fasting is to bring him/herself closer to Allah.

Niyyah (Intention) for Fasting in Ramadhan.
نَوَيْتُ صَوْمَ غَدٍ عَنْ أَدَاءِ فَرْضِ رَمَضَانَ هَذِهِ السَّنَةِ لِلَّهِ تَعَالَى
Nawaitu sawma ghadin 'an adaa-i fardhi Ramadhaana hadhihis-sanati lillaahi ta'aalaa.
O Allah, I intend to fast for this day in order to perform my duty towards You in the month of Ramadhan of the present year.

Du'aa for Breaking the Fast,
اَللّهُمَّ لَكَ صُمْتُ وَعَلى رِزْقِكَ أَفْطَرْتُ

Allaahumma laka sumtu wa 'alaa rizqika aftartu.
O Allah! For You have I fasted and upon Your sustenance have I broken my fast.

Sources and Further Reading:
Islam for Muslims

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