Sunan an-Nasa'i, Volume 3, Book 24, Hadith 2735 (DarusSalam) ⓘ

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."

أَخْبَرَنَا قُتَيْبَةُ، عَنْ مَالِكٍ، عَنِ ابْنِ شِهَابٍ، عَنْ مُحَمَّدِ بْنِ عَبْدِ اللَّهِ بْنِ الْحَارِثِ بْنِ نَوْفَلِ بْنِ الْحَارِثِ بْنِ عَبْدِ الْمُطَّلِبِ، أَنَّهُ حَدَّثَهُ أَنَّهُ، سَمِعَ سَعْدَ بْنَ أَبِي وَقَّاصٍ، وَالضَّحَّاكَ بْنَ قَيْسٍ، - عَامَ حَجَّ مُعَاوِيَةُ بْنُ أَبِي سُفْيَانَ - وَهُمَا يَذْكُرَانِ التَّمَتُّعَ بِالْعُمْرَةِ إِلَى الْحَجِّ فَقَالَ الضَّحَّاكُ لاَ يَصْنَعُ ذَلِكَ إِلاَّ مَنْ جَهِلَ أَمْرَ اللَّهِ تَعَالَى ‏.‏ فَقَالَ سَعْدٌ بِئْسَمَا قُلْتَ يَا ابْنَ أَخِي ‏.‏ قَالَ الضَّحَّاكُ فَإِنَّ عُمَرَ بْنَ الْخَطَّابِ نَهَى عَنْ ذَلِكَ ‏.‏ قَالَ سَعْدٌ قَدْ صَنَعَهَا رَسُولُ اللَّهِ صلى الله عليه وسلم وَصَنَعْنَاهَا مَعَهُ ‏.‏