Narrated Umm Salamah, Ummul Mu'minin: She never saw the Prophet (ﷺ) fasting the whole month except Sha'ban which he combined with Ramadan
Gradings in the source
SahihAl-Albani
SahihMuhammad Muhyi Al-Din Abdul Hamid
Isnaad SahihZubair Ali Zai
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