Ikrimah bin Khalid narrates: I asked Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) about a woman whom someone from outside Makkah wants to marry, and he is going for Umrah or Hajj. He replied: "When you are in the state of Ihram, do not marry, because the Prophet (peace and blessings of Allah be upon him) forbade this."
Hadith Referenceسنن الدارقطني / كتاب النكاح / 3649
Hadith Takhrij«أخرجه الدارقطني فى ((سننه)) برقم: 3649، وأحمد فى ((مسنده)) برقم: 6066»