Celebrate the days of Eid al-Adha and Ghadir.
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Eid al-Adha is Eid of thralldom. On this feast, following the Prophet
abraham, who sacrificed a sheep by God's command instead of his son;
Muslims also sacrificed a sheep as a sign of God's obedience and gave it
to the needy.
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Eid al-Ghadir is the Eid of pontificate.
After
the last pilgrimage that performed by Prophet Muhammad along with the
Muslims, when returning from Mecca, a place called Ghadir Khom, from
God, comes to the Prophet, the verse of the pontificate
_(یَا
أَیُّهَا الرَّسُولُ بَلِّغْ مَا أُنْزِلَ إِلَیْکَ مِنْ رَبِّکَ ۖ وَإِنْ
لَمْ تَفْعَلْ فَمَا بَلَّغْتَ رِسَالَتَهُ ۚ وَاللَّهُ یَعْصِمُکَ مِنَ
النَّاسِ ۗ إِنَّ اللَّهَ لَا یَهْدِی الْقَوْمَ الْکَافِرِین)
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(O Messenger, announce that which has been revealed to you from your
Lord, and if you do not, then you have not conveyed His message. And
Allah will protect you from the people. Indeed, Allah does not guide the
disbelieving people). God tells the Prophet to choose his successor.
Prophet Mohammad in Ghadir Khom introduces Imam Ali (as) as his
successor to all Muslims.
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See the full video at these addresses