One of the monumental and historic events that Muslims go through in Rajab is the Events of the Hijrah of the Muslims from Mecca to Habashah.
This event is motivated by oppression for the oppression experienced by the Muslims from the crimes of the idolaters of Quraish.
Occurs in the fifth year of prophecy and followed by approximately 82 men. Among the muhajirin are the friends of Usman bin Affan and his wife, daughter of Rasulullah, Ruqoyyah bint Muhammad.
Source
khazanahislamid