Sahih Bukhari
Fighting for the Cause of Allah (Jihaad)
Volume: 004 / Book Number: 052 / Hadith Number: 312
Narrated Abu Uthman An-Nahdi:
Mujashi (bin Mas'ud) took his brother Mujalid bin Musud to the Prophet and said, "This is Mujalid and he will give a pledge of allegiance to you for migration." The Prophet said, "There is no migration after the Conquest of Mecca, but I will take his pledge of allegiance for Islam."