Narrated Abu Huraira: The Prophet said, "None of you should fast a day or two before the month of Ramadan unless he has the habit of fasting (Nawafil) (and if his fasting coincides with that day) then he can fast that day."
Hadith ReferenceSahih Bukhari / The Book of As-Saum (The Fasting). / Hadith: 1914
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة