When was Eid ul Fitr first celebrated?

1. 3 AH
2. 4 AH
3. 5 AH
4. 2 AH

Eid ul Fitr was first celebrated in the year 2 AH (After Hijra). This was after the revelation of the commandment to fast in the month of Ramadan. The first Eid celebration marked the successful completion of the first obligatory Ramadan fast.