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)۔