Messenger of Allah 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).
أَنَّ رَسُولَ اللَّهِ ﷺ أَعْتَقَ صَفِيَّةَ وَتَزَوَّجَهَا وَجَعَلَ عِتْقَهَا صَدَاقَهَا وَأَوْلَمَ عَلَيْهَا بِحَيْسٍ