Charity is one of the five pillars of Islam and is regarded as an integral part of everyday life for many Muslims.
Eid-al-Adha is considered one of the most important annual festivals in the Islamic calendar and is celebrated to mark the end of Hajj. You can learn about Eid-al-Adha here -
http://www.fiyazmughal.org/celebrating-eid-al-adha/
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