Eid-ul-Fitr

On the day of Eid ul-Fitr, 

Amir al-Mu'minin Imām ‘Alī ibn Abī  Tālib (as) 

delivered a sermon in which he said:

"O Servants of Allah! Verily the minimum reward for those men 

and women who fasted (during Ramadhan), is an Angel, who calls out to them on the last day of the month of Ramadhan (saying): O   sins have been forgiven. Therefore, watch out in those things which serve as your re-creation (on this day and days to follow)" Servants of Allah! Rejoice of the Glad Tiding that all your previous 

[Reference: Nahjul-Balaghah]