Muwatta Malik Book 7, Hadith 27
Yahya related to me from Malik that Abd ar-Rahman ibn al-Qasim
said, "I heard Abdullah ibn Amir ibn Rabia say, 'I sometimes pray witr
while hearing the iqama, or after the break of dawn.' " Abd ar-Rahman
was not certain which he said.
Yahya related to me from Malik that Yahya ibn Said said, ''Ubada ibn as-Samit used to lead the people in prayer. One day he came out for subh and the muadhdhin began to give the iqama for the subh prayer Ubada silenced him, prayed witr and then led them in subh."
Malik related to me that Abd ar-Rahman ibn al-Qasim heard his father al-Qasim ibn Muhammad say, "I have prayed witr after dawn."
Malik said, "Only a person who oversleeps so that he does not do the witr prays it after dawn. No one should intentionally make his witr after dawn."