(34) باب التَّمَتُّعِ وَالإِقْرَانِ وَالإِفْرَادِ بِالْحَجِّ وَفَسْخِ الْحَجِّ لِمَنْ لَمْ يَكُنْ مَعَهُ هَدْى
Narrated Marwan bin Al-Hakam:
I saw `Uthman and `Ali. `Uthman used to forbid people to perform Hajj-at-Tamattu` and Hajj-al- Qiran (Hajj and `Umra together), and when `Ali saw (this act of `Uthman), he assumed Ihram for Hajj and `Umra together saying, "Lubbaik for `Umra and Hajj," and said, "I will not leave the tradition of the Prophet (ﷺ) on the saying of somebody."
Reference: Sahih al-Bukhari 1563
In-book reference: Book 25, Hadith 49
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 2, Book 26, Hadith 634