The Prophet (sallallahu alayhi wa sallam) used to observe Itikaf every year (during Ramadan) for ten days; in the year in which he passed away, he observed Itikaf for twenty days.
وعن أبي هريرة رضي الله عنه
قال: كان النبي صلى الله عليه وسلم يعتكف في كل رمضان عشرة أيام، فلما كان العام الذي قبض فيه اعتكف عشرين يومًا
The Prophet (sallallahu alayhi wa sallam) used to observe Itikaf every year (during Ramadan) for ten days; in the year in which he passed away, he observed Itikaf for twenty days.
Who passed it on, from Imam an-Nawawi back to the one who was there.
The same words, in another collection.
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