Muwatta Malik Book 7, Hadith 31
Yahya related to me from Malik from Sharik ibn Abdullah ibn Abi
Namir that Abu Salama ibn Abd ar-Rahman said, "Some people heard the
iqama and started to pray. The Messenger of Allah, may Allah bless him
and grant him peace, came out and said, 'Are you doing two prayers at
the same time? Are you doing two prayers at the same time?' That was
about the subh prayer and the two rakas before subh."
Malik related to me from Yahya ibn Said that A'isha, the wife of the Prophet, may Allah bless him and grant him peace, said, "The Messenger of Allah, may Allah bless him and grant him peace, used to pray the two rakas of the dawn (fajr) so quickly that I would say to myself 'Has he recited the umm al-Qur'an or not?' "
Yahya related to me from Malik that he had heard that Abdullah ibn Umar missed the two rakas of dawn, and then did them after the sun rose.