Sunan an-Nasa'i, Hadith 2723 ⓘ
It was narrated that Al-Hakam said: "I heard 'Ali binHusain narrating from Marwan, that 'Uthman forbade Mut'ah and joining Hajj and "Umrah. 'Ali said; 'Labbaika bi Hajjatin wa 'Umratin ma'an Here I am, (O Allah) for Hajj and "Umrah together. 'Uthman said: 'Are you doing this when I have forbidden it?' 'Ali said; 'I will not give up the Summah of the Messenger of Allah for any of the people.'''
أَخْبَرَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ، قَالَ أَنْبَأَنَا أَبُو عَامِرٍ، قَالَ حَدَّثَنَا شُعْبَةُ، عَنِ الْحَكَمِ، قَالَ سَمِعْتُ عَلِيَّ بْنَ حُسَيْنٍ، يُحَدِّثُ عَنْ مَرْوَانَ، أَنَّ عُثْمَانَ، نَهَى عَنِ الْمُتْعَةِ، وَأَنْ يَجْمَعَ الرَّجُلُ بَيْنَ الْحَجِّ وَالْعُمْرَةِ فَقَالَ عَلِيٌّ لَبَّيْكَ بِحَجَّةٍ وَعُمْرَةٍ مَعًا . فَقَالَ عُثْمَانُ أَتَفْعَلُهَا وَأَنَا أَنْهَى عَنْهَا فَقَالَ عَلِيٌّ لَمْ أَكُنْ لأَدَعَ سُنَّةَ رَسُولِ اللَّهِ صلى الله عليه وسلم لأَحَدٍ مِنَ النَّاسِ .
also referenced under: Book 24, Hadith 0 (In-Book) & Volume 3, Book 24, Hadith 2724 (DarusSalam)