From Sahih Bukhari (Hadith 5287):
Narrated Ibn 'Abbas:Qariba, The daughter of Abi Umaiyya, was the wife of 'Umar bin Al-Khattab. 'Umar divorced her and then Mu'awiyya bin Abi Sufyan married her. Similarly, Um Al-Hakam, the daughter of Abi Sufyan was the wife of 'Iyad bin Ghanm Al-Fihri. He divorced her and then 'Abdullah bin 'Uthman Al-Thaqafi married her
Reference: Bukhari 5287