Musnad Ahmad 32:1260

'Abd al-Samad narrated to us, Sulayman narrated to us, Thabit narrated to us, from Anas, who said: A funeral procession passed by the Prophet, may Allah bless him and grant him peace, and it was praised with good. He said: "It has become incumbent." Then another funeral procession passed by, and it was praised with evil. He said: "It has become incumbent."