Sahih Muslim Book 43, Hadith Number 7189.

Chapter : Pertaining to the verse: these two Adversaries who dispute about their Lord.

Abu Dharr took an oath that this verse: “These two adversaries who dispute about their Lord” (xxii. 19) was revealed in connection with those who on the Day of Badr came out (of rows to fight against the non-believers and they were) Hamza, ‘Ali, ‘Ubaida b. Harith (from the side of the Muslims) and ‘Utba and Shaiba, both of them the sons of Rabi’a and Walid b. ‘Utba (from the side of the non-believers of Mecca).