Musnad Abu Ya'la al-Mawsili 155:190

Abu Musa Muhammad ibn al-Muthanna narrated to us, Abd al-Wahhab narrated to us, Ayyub narrated to us, from Yahya ibn Abi Kathir, from Abu Salamah, from Abu Hurayrah, who said: He forbade hastening [the fast] by a day or two before Ramadan.