Musnad Ahmad 30:3653

Muhammad ibn Abdullah, who is Abu Ahmad al-Zubayri, narrated to us, Kathir ibn Zayd narrated to us, from Amr ibn Tamim, from his father, from Abu Hurayrah, who said: The Messenger of Allah, peace and blessings of Allah be upon him, said: "Your month has overshadowed you." Then he mentioned it.