Sahih Bukhari
Wedlock, Marriage (Nikaah)
Volume: 007 / Book Number: 062 / Hadith Number: 100
Narrated Thabit:
The marriage of Zainab bint Jahash was mentioned in the presence of Anas and he said, "I did not see the Prophet 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."