It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that when the Messenger of Allah (peace and blessings be upon him) observed i'tikaf, his bedding and his couch would be laid out for him (peace and blessings be upon him) by the Pillar of Repentance (Ustuwanat al-Tawbah), on the side facing the qiblah, and then he (peace and blessings be upon him) would lean against that pillar.
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from Nafi' except Isa bin Umar, and al-Darawardi is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب الميم / 8071
Hadith Takhrij«أخرجه ابن خزيمة فى «صحيحه» برقم: 2236، وابن ماجه فى «سننه» برقم: 1774، والبيهقي فى «السنن الكبرى» برقم: 10393، والطبراني فى «الكبير» برقم: 13424»