The holy Prophet(SAW):The world will not come to an end until a man from my family (ahl al-bayt), who will be called al-Mahdi, emerges to rule upon my community.(Bihar al-anwar,V51,P75)

Event of Ghadir e Khum

The 18th of Zill Hijja marks the auspicious occasion of Eid-e-Ghadir. This is the day of nomination of Imam Ali (as) as the successor to the Holy Prophet (pbuh) and commander of the faithful and the first Imam. This is also the day when the famous verse Ayat e Ikmaal " [Today we completed the DEEN for you and finalized the NAIMAT for you] announcing the completion of the DEEN and the finalization of the NAIMAT (blessings) was sent.
This is a highly virtuous day about which Imam Ali Reza (as) has said that "On the day of judgement four days will be presented before Allah (swt) with such glamour as that of a bride - Day of Friday, Eid-ul-Fitr, Eid-ul-Azha and Eid-e-Ghadir - and the day of Eid-e-Ghadir will be the most distinct and will be

like a moon among stars".
This is the day of acceptance of prayers, the day of sending SALAWAT on the Prophet Muhammad (pbuh) and his Ahl-e-Bait (as), the day of praying with utmost attention and commitment, the day of staying away from sins, the day of greeting and embracing other mo'min (brother in faith) with joy.