Malik related to me that Abd ar-Rahman ibn al-Qasim heard hisfather al-Qasim ibn Muhammad say, "I have prayed witr after dawn."Malik said, "Only a person who oversleeps so that he does notdo the witr prays it after dawn. No one should intentionally make hiswitr after dawn." (ID)
App reference (ID): Book 7, Hadith 28 (ID)
USC-MSA web (English) reference: Book 7, Hadith 28 (ID)
Arabic reference (ID): Book 7, Hadith 282 (ID)