"Ali and 'Uthman performed Hajj, and when we were partway there, 'Uthman forbade Tamattu, 'Ali said 'When you see him setting out, set out with him (saying the Talbiyah for 'Umrah)So 'Ali and his companions recited the Talbiyah for 'Umrah, and 'Uthman did not forbid them. 'Ali said: 'Have I not been told that you did.' Ali said to him: 'Did you not hear that the Messenger of Allah did Tamattu? He said: 'Of course (Using translation from Nasāʾī 2733)
«إِذَا رَأَيْتُمُوهُ قَدِ ارْتَحَلَ فَارْتَحِلُوا» فَلَبَّى عَلِيٌّ وَأَصْحَابُهُ بِالْعُمْرَةِ فَلَمْ يَنْهَهُمْ عُثْمَانُ قَالَ عَلِيٌّ أَلَمْ أُخْبَرْ أَنَّكَ تَنْهَى عَنِ التَّمَتُّعِ؟ قَالَ بَلَى فَقَالَ لَهُ عَلِيٌّ أَلَمْ تَسْمَعْ رَسُولَ اللهِ ﷺ تَمَتَّعَ؟ قَالَ بَلَى