The Prophet (ﷺ) did not give a better wedding banquet on the occasion of marrying any of his wives than the one he gave on marrying Zainab, and that banquet was with (consisted of) one sheep.
Sahih al-Bukhari Book 67, Hadith 103
← Previous Hadith When `Abdur-Rahman bin `Auf married an Ansari woman, the Prophet (ﷺ) asked him, "How much Mahr did you give her?" `Abdur-Rahman said, "Gold equal to the weight of a date stone." Anas added: When they (i.e. the Prophet (ﷺ) and his companions) arrived at Medina, the emigrants stayed at the Ansar's houses. `Abdur-Rahman bin `Auf stayed at Sa`d bin Ar-Rabi's house. Sa`d said to `Abdur- Rahman, "I will divide and share my property with you and will give one of my two wives to you." `Abdur-Rahman said, "May Allah bless you, your wives and property (I am not in need of that; but kindly show me the way to the market)." So `Abdur-Rahman went to the market and traded there gaining a profit of some dried yoghurt and butter, and married (an Ansari woman). The Prophet (ﷺ) said to him, "Give a banquet, even if with one sheep."

Sahih al-Bukhari Book 67, Hadith 102 Next Hadith → 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).

Sahih al-Bukhari Book 67, Hadith 104