The Messenger of Allah (ﷺ) as saying: Do not fast one day or two days just before Ramadan, except in the case of a man who has been in the habit of observing the particular fast, for he may fast on that day.
Reference: Sunan Abi Dawud 2335 In-book : Book 14, Hadith 23 English translation : Book 13, Hadith 2328
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