Fast observers from the point of view of their intention (niyyat) for eating at dawn (sahri) and fast breaking (iftar) may be classified as follows:
1. Those who do not make any special intention for eating sahri and iftar and simply eat to enjoy the food taste as well as to make up for the hunger during the fasting.
2. Those who eat sahri and iftar with the intention of enjoying the food taste and make up for the hunger, but at the same time with the intention that eating sahri and iftar are recommended (mustahab) and help a person in his worshipping.
3. Those who eat sahri and iftar because, it is recommended, Allah likes it, and it helps a person in worshipping, but in addition to that also pay due regard to special etiquette and instructions about sahri and iftar - etiquette such as recital of Holy Qur'an, engaging in special supplications before, after, and during sahri and iftar, and praising and thanking Allah (the Glorious, the Exalted).
One of the most important etiquette and instruction is the recital of Surah al-Qadr (Power) before taking sahri and iftar as well as recital of the illustrious and illuminated supplication:
"Allahuma rabb al-nur al-'adheem" (Allah is the possessor of great illumination)
which has been given in the book of Iqbal written by the most esteemed and famous scholar Sayyid ibn Taoos.
About this supplication it has been narrated from Imam al-Sadiq [a] that the Holy Prophet [s] has recommended recital of this prayer to Commander of the Faithful [s] Imam 'Ali [a] and said that Archangel Gabriel came to me and said:
"Whoever in the Holy Month of Ramadhan before iftar recites this prayer, Allah answers his prayer, accepts his prayer and fasting, grants his ten requirements, forgives his sins, removes his grief, makes his heart at ease, grants his wishes, makes his deeds to ascend upward with the deeds of prophets and righteous saints, and on the Day of Judgement brings him to His presence with a face illuminated like bright moon."
Suluk-i Arifan; Haj Mirza Javad Agha Maliki Tabrizi