مُوَطَّأُ مَالِكٍ
Muwatta Malik 777
Hajj
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ نَافِعٍ، أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ، كَانَ يَقُولُ لاَ يَنْكِحِ الْمُحْرِمُ وَلاَ
Yahya related to me from Malik, from Nafi, that Abdullah ibn Umar used to say, "Someone in ihram may neither get married, nor arrange a marriage for himself or others."
Arabic/English book reference: Book 20, Hadith 73