´Nubaih bin Wahb narrated:` "Ibn Ma'mar wanted to have his son married. S he sent me to Aban bin Uthman who was the Amir of the (Hajj) season. I went to him and said: 'Your brother wants to marry his son and he would like for you to witness that.' He said: 'I think he is but a crude Bedouin; indeed the Muhrim is not to marry nor have someone married'" - or he said similarly - then he narrated from Uthman similar in Marfu form (from the Prophet).
Hadith Referenceسنن ترمذي / كتاب الحج عن رسول الله صلى الله عليه وسلم / 840
1؎: The legal (shar‘i) principle is precisely this: a person in the state of ihram (muhrim) can neither contract a marriage (nikah) for himself nor can he conduct the marriage of another while in the state of ihram.
Explanation & Benefits
Shaykh Dr. Abdur Rahman Freywai
1: The legal (shar‘i) principle is that a person in the state of ihram (muhrim) can neither contract a marriage (nikah) for himself nor conduct a marriage on behalf of someone else while in the state of ihram.
Source: Sunan al-Tirmidhi – Majlis ‘Ilmi Dar al-Da‘wah, New Delhi Edition, Page: 840