حَدَّثَنَا هَنَّادٌ عَنْ أَبِي بَکْرٍ عَنْ أَبِي حُصَيْنٍ عَنْ أَبِي صَالِحٍ عَنْ أَبِي هُرَيْرَةَ قَالَ کَانَ النَّبِيُّ صَلَّی اللَّهُ عَلَيْهِ وَسَلَّمَ يَعْتَکِفُ کُلَّ رَمَضَانَ عَشَرَةَ أَيَّامٍ فَلَمَّا کَانَ الْعَامُ الَّذِي قُبِضَ فِيهِ اعْتَکَفَ عِشْرِينَ يَوْمًا
سنن ابودوٗد · Hadith 2466
Abu Hurairah said: The Prophet ﷺ used to observe Itikaf during ten days of Ramadan every year. But when the year in which he died, he observed Itikaf for twenty days.
Translated by Dr. Muhammad Muhsin Khan · Reviewed by Islamic University of Madinah · Published March 2020