According to Abû Hurayra (Radia ALLAH 3anhoe), the Messenger of GOD (Sal ALLAH A3leyhi wa SALAM) said :
The doors of Paradise are open every Monday and Thursday.
All the servants who do not associate anything with God are then forgiven except humans
who feeds some animosity towards his brother.
It is said : «Defer absolution for these two until they reconcile».
[Reported by Muslim, Mâlik and Abû Dâwûd]
It is forbidden to fast during the days of Eid.