Musnad Ahmad 32:13

Hashim narrated to us, he said: Ali ibn Zayd informed us, from Anas ibn Malik, who said: I heard him narrating, he said: "I witnessed two wedding feasts of the wives of the Messenger of Allah, peace and blessings of Allah be upon him." He said: "And we were not fed bread or meat in either of them." He said: "Then what?" He said: "Al-Hays—meaning dates—and dried yogurt with ghee."