It is narrated from Uthman (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "A person in the state of ihram should neither marry nor arrange a marriage."
Hadith Referenceمسند الإمام الشافعي / كتاب الحج / 866
Hadith Takhrijاخرجه مسلم النکاح باب تحريم نكاح المحرم ، وكراهة خطبة (1409)۔
It is narrated from Uthman (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "A person in the state of Ihram should neither marry, nor arrange a marriage, nor propose."
Hadith Referenceمسند الإمام الشافعي / كتاب الحج / 867
It is narrated from Nabiya bin Wahb that Umar bin Ubaidullah intended to marry Talha bin Umar to the daughter of Shaibah bin Jubair, so he sent a message to Aban bin Uthman to participate (in the marriage), and both (the ones to be married) were in the state of ihram. Aban refused to participate and said: I heard Uthman bin Affan (may Allah be pleased with him) say that the Messenger of Allah (ﷺ) said: "Neither should a person in ihram marry, nor arrange a marriage, nor propose."
Hadith Referenceمسند الإمام الشافعي / كتاب الحج / 868
Through another chain from Uthman (may Allah be pleased with him), a hadith with similar meaning to the previous hadith is narrated from the Prophet (ﷺ).
Hadith Referenceمسند الإمام الشافعي / كتاب الحج / 869
Hadith Takhrijاخرجه مسلم النکاح باب تحريم نكاح المحرم ، وكراهة خطبة (1409)۔
It is narrated from Ibn Umar (may Allah be pleased with them) that he said: "A person in the state of Ihram should neither marry, nor arrange a marriage for someone else, nor propose, nor arrange a proposal for someone else."
Hadith Referenceمسند الإمام الشافعي / كتاب الحج / 870
Hadith Takhrijصحيح اخرجه البيهقي : 213/7 - وفى المعرفة السنن والآثار له (4247) وابن ابي شيبة (12974)۔
It is narrated from Abu Ghatfan bin Tarif Al-Mari that he reported his father Tarif married a woman while in the state of Ihram, so Umar bin Khattab (may Allah be pleased with him) annulled their marriage.
Hadith Referenceمسند الإمام الشافعي / كتاب الحج / 871
Hadith Takhrijصحیح: اخرجه البيهقي : 213/7،66/5 ومالك في الموطا النكاح، باب نكاح المحرم۔