Muwatta Malik Book 7, Hadith 32
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.
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."
Yahya related to me from Malik from Abd ar-Rahman ibn al-Qasim that al-Qasim ibn Muhammad had done the same as Ibn Umar.