From Sahih Bukhari (Hadith 5171):
Narrated Thabit:The marriage of Zainab bint Jahash was mentioned in the presence of Anas and he said, "I did not see the Prophet (ﷺ) giving a better banquet on marrying any of his wives than the one he gave on marrying Zainab. He then gave a banquet with one sheep
Reference: Bukhari 5171