Sunan An-Nasa'i
Hadith #2722
It was narrated that Marwan bin Al-Hakam said:""I was sitting with 'Uthan and he heard 'Ali reciting the Talbiyah for ""Umrah and Hajj (together). He said 'Were you not forbidden to do this?' He said: 'Yes, but I heard the Messenger of ""Allah reciting the Talbiyah for them together, and I will not igore what the Messenger of Allah said in favor of what you say