Eid al-Adha

"Sacrifice", like other acts and rituals, has a soul called piety, and the holiness and excellence of the sacrifice comes from this piety, not from its flesh and blood.

Aside from the unique and important ritual of hajj, which is one of the pillars of Islam and must be performed in The month of Dhul Hijjah, this month includes some other important events as well. 

Eid al-Adha (i.e. Feast of Sacrifice) is one of the important religious festivals in the Islamic calendar. The ocassion is not just about festivity and merry-making. Rather, it is a reflection on the submission of the Prophets Ibrahim and Isma'il (peace be upon them) to Allah's commandment.

وَفَدَيْنَاهُ بِذِبْحٍ عَظِيمٍ، الصافات:107

قال الامام السجاد علیه السلام:إِذَا ذَبَحَ الْحَاجُّ كَانَ فَدَاهُ مِنَ النَّار،بحار الانوار، ج96