Jami` at-Tirmidhi 3171
جامع الترمذي#3171SahihNarrated Ibn 'Abbas:"When the Prophet (ﷺ) was expelled from Makkah, Abu Bakr said: 'They have driven out their Prophet to their own doom.' So Allah, Most High, 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 (22:39).' So Abu Bakr said: 'Then I knew that there would be fighting
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Ahmad Muhammad ShakirSahih Isnaad
Al-AlbaniSahih Isnaad
Zubair Ali ZaiSahih
In-book reference: 47:223