Yahya related to me from Malik from Sharik ibn Abdullah ibn AbiNamir that Abu Salama ibn Abd ar-Rahman said, "Some people heard theiqama and started to pray. The Messenger of Allah, may Allah bless himand grant him peace, came out and said, 'Are you doing two prayers atthe same time? Are you doing two prayers at the same time?' That wasabout the subh prayer and the two rakas before subh."
App reference: Book 7, Hadith 31
USC-MSA web (English) reference: Book 7, Hadith 31
Arabic reference: Book 7, Hadith 285