Sahih Bukhari | Volume 5 | Hadith Number 310

Narrated by 'Abdur-Rahman bin 'Auf
I had an agreement with Umaiya bin Khalaf (that he would look after my relatives and property in Mecca, and I would look after his relatives and property in Medina)." 'Abdur- Rahman then mentioned the killing of Umaiya and his son on the day of Badr, and Bilal said, "Woe to me if Umaiya remains safe (i.e. alive)."