Narrated Sa'eed bin Jubair:
"When the Prophet (ﷺ) was expelled from Makkah a man said: 'They have driven out their Prophet' so (the following) was revealed: "Permission (to fight) is given to those who are fought against, because they have been wronged; and surely, Allah is able to give them victory. Those who have been expelled from their homes unjustly (22:39)." [Those who were expelled were the Prophet (ﷺ) and his Companions.]
English reference: Vol. 5, Book 44, Hadith 3172
Arabic reference: Book 47, Hadith 3471