Mab’ath means appointment.

Eid al-Mab’ath is the anniversary of the official start of the receipt of the Quran to Prophet Muhammad (ṣ) marking the initiation of his open propagation of the message of Islam. 

Prophet Muhammad (ṣ) began his mission when he was 40 years old with the Quran starting to be revealed to him while he was in the cave of Hira’ on the Mountain of Nur on the outskirts of Mecca. 

In the Shi’ah view, this event occurred on the 27th of Rajab.