Sayyiduna Abu Hurayrah (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) forbade hastening the month of Ramadan by fasting one or two days, except for a person who was already fasting and this day coincided with his fasts.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيام / 7963