The Prophet (peace and blessings be upon him) said:
"The one in the state of ihram should not marry himself, nor arrange anyone else's marriage, nor make a proposal of marriage."
Hadith Referenceصحیح الجامع الصغیر / حرف اللام ألف / 7809
Hadith Gradingالألبانی:صحيح
Hadith Takhrij[م د ن هـ] عن عثمان. مختصر مسلم ٨١٤، الإرواء ١٠٣٧، ١٨٨٨.