Sahih Al-Bukhari – Volume 3 – Book 30 – P.88

(14) CHAPTER. Not to observe Saum (fast) for a day or two ahead of Ramadãn.

1914. Narrated Abü Hurairah:  The Prophet, peace be upon, said, “None of you should observe Saum (fast) from a day or two ahead of Ramadan unless he has the habit of observing Saum (Nawafil) (and if his fasting coincides with that day) then he can observe Saum (fast) on that day.”

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