Yahya related to me from Malik, from Ibn Shihab, that Muhammad
ibn Abdullah ibn al-Harith ibn Nawfal ibn Abd al-Muttalib told him
that he had heard Sad ibn Abi Waqqas and ad-Dahhak ibn Qays discussing
tamattu in between umra and hajj. Ad-Dahhak ibn Qays said, "Only
someone who is ignorant of what Allah, the Exalted and Glorified, says
would do that." Whereupon Sad said, "How wrong is what you have just
said, son of my brother!" Ad-Dahhak said, ''Umar ibn al-Khattab
forbade that," and Sad said, "The Messenger of Allah, may Allah bless
him and grant him peace, did it, and we did it with him."
Muwatta Malik Book 20, Hadith 62