"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).  

عَنْ نُبَيْهِ بْنِ وَهْبٍ قَالَ أَرَادَ ابْنُ مَعْمَرٍ أَنْ يُنْكِحَ ابْنَهُ فَبَعَثَنِي إِلَى أَبَانَ بْنِ عُثْمَانَ وَهُوَ أَمِيرُ الْمَوْسِمِ بِمَكَّةَ فَأَتَيْتُهُ فَقُلْتُ إِنَّ أَخَاكَ يُرِيدُ أَنْ يُنْكِحَ ابْنَهُ فَأَحَبَّ أَنْ يُشْهِدَكَ ذَلِكَ قَالَ لاَ أُرَاهُ إِلاَّ أَعْرَابِيًّا جَافِيًا إِنَّ الْمُحْرِمَ لاَ يَنْكِحُ وَلاَ يُنْكِحُ أَوْ كَمَا قَالَ ثُمَّ حَدَّثَ عَنْ عُثْمَانَ مِثْلَهُ يَرْفَعُهُ وَفِي الْبَابِ عَنْ أَبِي رَافِعٍ وَمَيْمُونَةَ  

"The Messenger of Allah married Maimunah while he was Halal, and he stayed with her while he was Halal, and I was the messenger between the two of them."  

تَزَوَّجَ رَسُولُ اللَّهِ ﷺ مَيْمُونَةَ وَهُوَ حَلاَلٌ وَبَنَى بِهَا وَهُوَ حَلاَلٌ وَكُنْتُ أَنَا الرَّسُولَ فِيمَا بَيْنَهُمَا