Musnad Ahmad
It was narrated from Aban bin `Uthman, from his father, that the Prophet (ﷺ)said: “The pilgrim in ihram should not get married, arrange a marriage or propose marriage.`
حَدَّثَنَا يَحْيَى بْنُ سَعِيدٍ، عَنْ مَالِكٍ، حَدَّثَنِي نَافِعٌ، عَنْ نُبَيْهِ بْنِ وَهْبٍ، عَنْ أَبَانَ بْنِ عُثْمَانَ، عَنْ أَبِيهِ، عَنْ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ الْمُحْرِمُ لَا يَنْكِحُ وَلَا يُنْكِحُ وَلَا يَخْطُبُ.
Grade: lts isnad is Sahih, Muslim (1409)] (Darussalam)
Reference