Muwatta Malik #796

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."