Al-Matalib al-'Aliyah 1174 — Changing Hajj into Umrah and the reverse

It is narrated from Muhammad bin Sirin (may Allah have mercy on him) that Sayyiduna Imran bin Husayn (may Allah be pleased with him) arrived with some of his companions, who had combined Hajj and Umrah (in their ihram). When Sayyiduna Uthman bin Affan (may Allah be pleased with him) was informed that Imran had come with his companions having entered a combined ihram for Hajj and Umrah, he sent him a message: "Choose one of the two." At this Sayyiduna Imran (may Allah be pleased with him) said: "The Commander of the Believers has forbidden us (from performing qiran in this way), and he has also given us a choice; so I choose Hajj."
From a scholarly and juristic standpoint, the intent of Sayyiduna Uthman al-Ghani (may Allah be pleased with him) was that visitors should make the journeys of Hajj and Umrah separately, so that the House of Allah would remain lively and frequented throughout all the months of the year; and Sayyiduna Imran (may Allah be pleased with him), out of respect for the order of the Commander of the Believers and for the sake of the order of the community, adopted the form proposed by the caliph instead of his own preference.