Ibn Maʿmar wanted to marry his son to the daughter of Shaibah bin Jubair. So he sent me to Aban bin ʿUthman who was the Ameer of Hajj. I came to him and said to him: Your brother wants to arrange his sonʿs marriage and wants you to witness it. He said: I think you are no more than an ill-mannered Iraqi. The pilgrim in ihram should not get married or arrange a marriage. Then he narrated a similar report from ʿUthman ؓ and attributed it to the Prophet ﷺ
عَنْ نُبَيْهِ بْنِ وَهْبٍ قَالَأَرَادَ ابْنُ مَعْمَرٍ أَنْ يُنْكِحَ ابْنَهُ ابْنَةَ شَيْبَةَ بْنِ جُبَيْرٍ فَبَعَثَنِي إِلَى أَبَانَ بْنِ عُثْمَانَ وَهُوَ أَمِيرُ الْمَوْسِمِ فَأَتَيْتُهُ فَقُلْتُ لَهُ إِنَّ أَخَاكَ أَرَادَ أَنْ يُنْكِحَ ابْنَهُ فَأَرَادَ أَنْ يُشْهِدَكَ ذَاكَ فَقَالَ أَلا أُرَاهُ عِرَاقِيًّا جَافِيًا إِنَّ الْمُحْرِمَ لَا يَنْكِحُ وَلا يُنْكِحُ ثُمَّ حَدَّثَ عَنْ عُثْمَانَ بِمِثْلِهِ يَرْفَعُهُ