The following dua (prayers) are recited at the beginning and end of the fast to indicate and affirm the intention of the fast.
A person’s intention when fasting, is to bring him/herself closer to God.
The purpose of making an intention before every deed is to remind our inner self and confirm with our verbal intention that we seek the pleasure of God in our all actions.
Dua (Prayer) at the Beginning of the Fast 1
وَبِصَوْمِ غَدٍ نَّوَيْتُ مِنْ شَهْرِ رَمَضَانَ
Wa bisawmi ghadinn nawaiytu min shahri ramadan
I intend to keep the fast for tomorrow in the month of Ramadan
Or you can also recite the following:
Dua (Prayer) at the Beginning of the Fast 2
نـَوَيْتُ صَوْمَ غـَدٍ عَـنْ ا َدَاءِ فـَرْضِ شـَهْرِ رَمـَضَانَ هـَذِهِ السَّـنـَةِ لِلـّهِ تـَعَالىَ
Nawaitu sauma ghadin anadai fardu syahri ramadhana hadzihissanati lillahitaala
I intend to do obligatory fast tomorrow in the month of Ramadan this year because of Allah
Dua (Prayer) at the End of the Fast
اللَّهُمَّ اِنِّى لَكَ صُمْتُ وَبِكَ امنْتُ وَعَليْكَ تَوَكّلتُ وَ عَلى رِزْقِكَ اَفْطَرْتُ
Allahumma inni laka sumtu wa bika aamantu wa alayka tawakkaltu wa ala rizq-ika-aftartu
O Allah! I fasted for You and I believe in You and I put my trust in You and I break my fast with Your sustenance