Nubayh bin Wahb said: Umar bin Ubaydullah intended to marry Talhah bin Umar to the daughter of Shaybah bin Jubayr, so he invited Aban bin Uthman, the leader of the Hajj. Aban said: I heard Sayyiduna Uthman bin Affan (may Allah be pleased with him) say that he heard the Messenger of Allah (peace and blessings be upon him) say: "The muhrim (one in the state of ihram) should not marry, nor have a marriage contracted for him, nor propose marriage."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النكاح / 14198