Musnad Abu Ya'la al-Mawsili 160:38

Ibrahim ibn Sa'id al-Jawhari narrated to us, al-Qasim ibn Salam ibn Miskin narrated to us, he said: My father narrated to me, he said: I asked al-Hasan about fasting on Friday, and he said: "He forbade it, except during consecutive days." He said: And Abu Rafi' narrated to me, from Abu Hurayrah, that the Messenger of Allah (peace and blessings of Allah be upon him) forbade fasting on Friday, except during days before it or after it.