Hadith 2335
Narrated Abu Hurairah: 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.
Hadith 2336
Narrated Umm Salamah, Ummul Muminin: She never saw the Prophet ﷺ fasting the whole month except Sha'ban which he combined with Ramadan.