Musnad Abu Ya'la al-Mawsili 249:4

Muhammad ibn Isma'il ibn Abi Samina al-Basri narrated to us, Muhammad ibn Mus'ab narrated to us, al-Awza'i narrated to us, from Abu 'Ammar Shaddad, from Wathilah ibn al-Asqa', who said: The Prophet, may Allah bless him and grant him peace, seated 'Ali to his right, and Fatimah to his left, and Hasan and Husayn in front of him. He covered them with a garment and said: "O Allah, these are the people of my house (Ahl al-Bayt), and the people of my house have come to You, not to the Fire."