When beginning the fast
Wa bisawmi ghadinn nawaiytu min shahri ramadan
I intend to keep the fast today in the month of Ramadan
When breaking the fast
Allahumma inni laka samtu wa bika aamantu wa 'ala
rizq-ika aftarthu
O Allah! I fasted for You and i believe in You and i break my
fast with Your sustenance
Allahumma inni as'aluka birahmatika al-lati wasi'at
kulli shay'in an taghfira li
O Allah! I ask You by Your Mercy wich envelopes all things, that
You forgive me
( a du'a that one of the companions used to say when breaking
his fast)
When you are fasting and someone is rude to you
Inni sa'iimu, inni sa'iimu
I am fasting, i am fasting
(sahih Bukhari)
Upon sighting of the new moon
Allahu akbar, Allahuma ahillahu 'alayna bil-amni
wal-imaani, was-salaamati, wal-islami, wat-tawfeeqi lima tuhibbu Rabbana wa tardha. Rabbuna wa RabbukAllahu
Allah is the greatest. O Allahu bring us the new moon with security
and faith, with peace and in Islam, and in harmony with what our Lord Loves and what pleases Him. Our Lord and your
Lord is Allah.
(at-Tirmidhi, ad-Darimi)