question #1 Sahih al-Bukhari 5169, Book 67, Hadith 104 : What is the significance of manumission in Islamic marriage customs?

Allah’s Messenger (ﷺ) manumitted Safiyya and then married her, and her Mahr was her manumission, and he
gave a wedding banquet with Hais (a sort of sweet dish made from butter, cheese and dates).