Musannaf Ibn Abi Shayba 16:48

Abu Bakr narrated to us, he said: Waki’ narrated to us, from Hammam, from Qatadah, from Sa’id ibn al-Musayyib, from Sa’d, that he used to eat it. He said: So I said to Sa’id, "What do you say about it?" He said, "I used to eat it."