Sunan An-Nasa'i

It was narrated from Muhammad bin 'Abdullah bin Al-Harith bin Nawfal bin Al-Harith bin 'Abdul-Muttalib that:during the year that Mu'awiyah bin abi sufyan performed Hajj, he heard Sa'd bin Abi Waqqas and Ad-Dahhak bin Qais talking about joining 'Umrah to Hajj (Tamattu) Ad-Dahhak said: ""none does that but one who is ignorant of the ruling of Allah."" Sa'd said: ""What a bad thing to say, O son of my brother!"" Ad-Dahhak said: ""Umar bin Al-Khattab forbade that."" Sa'd daid: ""The Messenger of Allah did that and we did it with him