Abu Dharr used to take an oath confirming that the Verse:
'These two opponents (believers, and disbelievers) dispute with each other about their Lord.' (22.19)
was Revealed in connection with Hamza and his two companions and `Utbah and his two companions
on the day when they ease out of the battle of Badr.
Sahih al-Bukhari Book 65, Hadith 265