The day of receiving Divine reward
The first day of the month of Shawwal is the day of Eid al-Fitr which is amongst the greatest Islamic festivals. This is an eid for the people who truly fasted; those whose acts of worship were accepted and whose sins were forgiven. Eid al-Fitr is an extremely important day for the Muslims because after one month of fasting, rising during the nights and worshipping, they have become prepared for receiving Divine reward.
Ayatullah Makarim Shirazi