Anas (may Allah be pleased with him) said: I never saw the Messenger of Allah (peace and blessings be upon him) give a wedding feast (walimah) for any of his wives like the one he gave for Zaynab (may Allah be pleased with her), for he (peace and blessings be upon him) slaughtered a sheep.
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 20489