بُلُوغُ الْمَرَامِ
Bulugh al-Maram 992
Marriage
وَعَنْ عُثْمَانَ - رضى الله عنه - قَالَ : قَالَ رَسُولُ اَللَّهِ - صلى الله عليه وسلم -{ لَا يَنْكِحُ اَلْمُحْرِمُ , وَلَا يُنْكَحُ } رَوَاهُ مُسْلِمٌ . وَفِي رِوَايَةٍ لَهُ : { وَلَا يَخْطُبُ } [1] .
Narrated 'Uthman (RA): Allah's Messneger (ﷺ) said: "One who is in Ihram may not marry, or be given in marriage." [Reported by Muslim]. In another narration by him it says: "He should not ask someone's hand in marriage."
Sunnah.com reference: Book 8, Hadith 28