The Hejira (Arabic: هِجْرَة ‎) is the migration or journey of the Islamic prophet Muhammad and his followers from Mecca to Yathrib, later renamed by him to Medina, in the year 622. In June 622, after being warned of a plot to assassinate him, Muhammad secretly left his home in Mecca to emigrate to Yathrib, 320 km (200 mi) north of Mecca, along with his companion Abu Bakr. Yathrib was soon renamed Madīnat an - Nabī (Arabic: مَـديـنـة الـنّـبي ‎, literally "City of the Prophet ''), but an - Nabī was soon dropped, so its name is "Medina '', meaning "the city ''.
who was the first one to migrate to madinah
Islamic prophet Muhammad