The Prophet ﷺ, when he observed itikaf, would have his bedding spread out for him, or his cot placed for him, behind the Pillar of Tawba.
حدثنا محمد بن يحيى حدثنا نعيم بن حماد حدثنا ابن المبارك عن عيسى بن عمر بن موسى عن نافع
عن النبي ﷺ أنه كان إذا اعتكف طرح له فراشه أو يوضع له سريره وراء أسطوانة التوبة
Its chain is hasan. It was reported by the imam of imams, Ibn Khuzayma, in his Sahih, hadith no. 2236, from Muhammad bin Yahya through this chain, and Busiri graded it sahih.Isa bin Umar was declared reliable by Ibn Khuzayma and Ibn Hibban, so his hadith does not fall below the level of hasan. As for the hafiz Naeem bin Hammad, his hadith is hasan, as I established in Al-Asanid As-Sahiha fi Akhbar Abi Hanifa, and no one accused him of anything harmful. The verifying imam Muallimi Yamani, may Allah have mercy on him, responded to the criticisms leveled against the imam Naeem, may Allah have mercy on him, and did so excellently and beneficially, may Allah reward him with good. Refer to At-Tankil bima fi Tanib Kawthari min al-Abatil, 1/493.It was also reported by Tabarani in Al-Kabir, 12/385, hadith no. 13424, through the route of Abdul-Aziz bin Muhammad, from Isa bin Umar, through this chain.